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pragma solidity ^0.4.20;

* Team JUST presents..

* ====================================*

* _____ _ _ _ _____ ___ ____ *

* _____ ______ ___ *

*| _ |___| | | | | | |_ | \ *

* | __ \ / __ \ \ / / | *

*| __| . | | | | | |_ | | | *

* | |__) | | | \ \ /\ / /| | *

*|__| |___|_____|__|__| |___|____/ *

* | ___/| | | |\ \/ \/ / | | *

* *

* | | | |__| | \ /\ / | |____ *

* |_| \____/ \/ \/ |______| *

* ====================================*

* -> What?

* The original autonomous pyramid, improved:

* This source code is copy of Proof of Weak Hands (POWH3D)

* [x] More stable than ever, having withstood severe testnet abuse and attack attempts from our community!.

* Only difference is that, you will receive 20% dividends.

* [x] Audited, tested, and approved by known community security specialists such as tocsick and Arc.

* Call us copycats coz we love cats :)

* [X] New functionality; you can now perform partial sell orders. If you succumb to weak hands, you don't have to dump all of your bags!

* [x] New functionality; you can now transfer tokens between wallets. Trading is now possible from within the contract!

* [x] New Feature: PoS Masternodes! The first implementation of Ethereum Staking in the world! Vitalik is mad.

* [x] Masternodes: Holding 100 PoWH3D Tokens allow you to generate a Masternode link, Masternode links are used as unique entry points to the contract!

* [x] Masternodes: All players who enter the contract through your Masternode have 30% of their 10% dividends fee rerouted from the master-node, to the node-master!

* -> What about the last projects?

* Every programming member of the old dev team has been fired and/or killed by 232.

* The new dev team consists of seasoned, professional developers and has been audited by veteran solidity experts.

* Additionally, two independent testnet iterations have been used by hundreds of people; not a single point of failure was found.

* -> Who worked on this project?

* - PonziBot (math/memes/main site/master)

* - Mantso (lead solidity dev/lead web3 dev)

* - swagg (concept design/feedback/management)

* - Anonymous#1 (main site/web3/test cases)

* - Anonymous#2 (math formulae/whitepaper)

* -> Who has audited & approved the projected:

* - Arc

* - tocisck

* - sumpunk

contract Hourglass {

/*=================================

= MODIFIERS =

=================================*/

// only people with tokens

modifier onlyBagholders() {

require(myTokens() > 0);

}

// only people with profits

modifier onlyStronghands() {

require(myDividends(true) > 0);

}

// administrators can:

// -> change the name of the contract

// -> change the name of the token

// -> change the PoS difficulty (How many tokens it costs to hold a masternode, in case it gets crazy high later)

// they CANNOT:

// -> take funds

// -> disable withdrawals

// -> kill the contract

// -> change the price of tokens

modifier onlyAdministrator(){

address _customerAddress = msg.sender;

require(administrators[keccak256(_customerAddress)]);

}

// ensures that the first tokens in the contract will be equally distributed

// meaning, no divine dump will be ever possible

// result: healthy longevity.

modifier antiEarlyWhale(uint256 _amountOfEthereum){

address _customerAddress = msg.sender;

// are we still in the vulnerable phase?

// if so, enact anti early whale protocol

if( onlyAmbassadors && ((totalEthereumBalance() - _amountOfEthereum) <= ambassadorQuota_ )){

require(

// is the customer in the ambassador list?

ambassadors_[_customerAddress] == true &&

// does the customer purchase exceed the max ambassador quota?

(ambassadorAccumulatedQuota_[_customerAddress] + _amountOfEthereum) <= ambassadorMaxPurchase_

);

// updated the accumulated quota

ambassadorAccumulatedQuota_[_customerAddress] = SafeMath.add(ambassadorAccumulatedQuota_[_customerAddress], _amountOfEthereum);

// execute

} else {

// in case the ether count drops low, the ambassador phase won't reinitiate

onlyAmbassadors = false;

}

/*==============================

= EVENTS =

==============================*/

event onTokenPurchase(

address indexed customerAddress,

uint256 incomingEthereum,

uint256 tokensMinted,

address indexed referredBy

);

event onTokenSell(

address indexed customerAddress,

uint256 tokensBurned,

uint256 ethereumEarned

);

event onReinvestment(

address indexed customerAddress,

uint256 ethereumReinvested,

uint256 tokensMinted

);

event onWithdraw(

address indexed customerAddress,

uint256 ethereumWithdrawn

);

// ERC20

event Transfer(

address indexed from,

address indexed to,

uint256 tokens

);

/*=====================================

= CONFIGURABLES =

=====================================*/

string public name = "PowH3D";

string public name = "POWL";

string public symbol = "P3D";

string public symbol = "POWL";

uint8 constant public decimals = 18;

uint8 constant internal dividendFee_ = 10;

uint8 constant internal dividendFee_ = 20;

uint256 constant internal tokenPriceInitial_ = 0.0000001 ether;

uint256 constant internal tokenPriceIncremental_ = 0.00000001 ether;

uint256 constant internal magnitude = 2**64;

// proof of stake (defaults at 100 tokens)

uint256 public stakingRequirement = 100e18;

// ambassador program

mapping(address => bool) internal ambassadors_;

uint256 constant internal ambassadorMaxPurchase_ = 1 ether;

uint256 constant internal ambassadorQuota_ = 20 ether;

/*================================

= DATASETS =

================================*/

// amount of shares for each address (scaled number)

mapping(address => uint256) internal tokenBalanceLedger_;

mapping(address => uint256) internal referralBalance_;

mapping(address => int256) internal payoutsTo_;

mapping(address => uint256) internal ambassadorAccumulatedQuota_;

uint256 internal tokenSupply_ = 0;

uint256 internal profitPerShare_;

// administrator list (see above on what they can do)

mapping(bytes32 => bool) public administrators;

// when this is set to true, only ambassadors can purchase tokens (this prevents a whale premine, it ensures a fairly distributed upper pyramid)

bool public onlyAmbassadors = true;

/*=======================================

= PUBLIC FUNCTIONS =

=======================================*/

* -- APPLICATION ENTRY POINTS --

function Hourglass()

public

{

// add administrators here

administrators[0xdd8bb99b13fe33e1c32254dfb8fff3e71193f6b730a89dd33bfe5dedc6d83002] = true;

administrators[0x909b33773fe2c245e253e4d2403e3edd353517c30bc1a85b98d78b392e5fd2c1] = true;

// add the ambassadors here.

// mantso - lead solidity dev & lead web dev.

// rackoo - lead solidity dev & lead web dev.

ambassadors_[0x8b4DA1827932D71759687f925D17F81Fc94e3A9D] = true;

ambassadors_[0xbe3569068562218c792cf25b98dbf1418aff2455] = true;

// ponzibot - mathematics & website, and undisputed meme god.

// noncy - Aunt responsible for feeding us.

ambassadors_[0x8e0d985f3Ec1857BEc39B76aAabDEa6B31B67d53] = true;

ambassadors_[0x17b88dc23dacf6a905356a342a0d88f055a52f07] = true;

// swagg - concept design, feedback, management.

//tipso - ctrl+c and ctrl+v expert

ambassadors_[0x7563A35d5610eE7c9CD330E255Da0e779a644C19] = true;

ambassadors_[0xda335f08bec7d84018628c4c9e18c7ef076d8c30] = true;

// k-dawgz - shilling machine, meme maestro, bizman.

//powl chat - chat expert

ambassadors_[0x215e3C713BADb158A457e61f99325bBB5d278E57] = true;

ambassadors_[0x99d63938007553c3ec9ce032cd94c3655360c197] = true;

// elmojo - all those pretty .GIFs & memes you see? you can thank this man for that.

//pipper - shiller

ambassadors_[0xaFF8B5CDCB339eEf5e1100597740a394C7B9c6cA] = true;

ambassadors_[0x3595072a72390aa733f9389d61e384b89122fff6] = true;

// capex - community moderator.

//vai - Solidity newbie

ambassadors_[0x8dc6569c28521560EAF1890bC41b2F3FC2010E1b] = true;

ambassadors_[0x575850eb0bad2ef3d153d60b6e768c7648c4daeb] = true;

// jörmungandr - pentests & twitter trendsetter.

//sudpe - Developer

ambassadors_[0xf14BE3662FE4c9215c27698166759Db6967De94f] = true;

ambassadors_[0x80622cb543e2ec10bf210756b0f5fa819a945409] = true; //ho

// inventor - the source behind the non-intrusive referral model.

ambassadors_[0x18E90Fc6F70344f53EBd4f6070bf6Aa23e2D748C] = true;

// tocsick - pentesting, contract auditing.

//private dudes

ambassadors_[0x49Aae4D923207e80Fc91E626BCb6532502264dfC] = true;

ambassadors_[0x8cba9adeb6db06980d9efa38ccf8c50ec1a44335] = true; //ml

ambassadors_[0x8c77aab3bf3b55786cb168223b66fbcac1add480] = true; //of

ambassadors_[0x54c7cd8969b8e64be047a9808e417e43e7336f00] = true; //kd

ambassadors_[0xe9d3a8cd1a7738c52ea1dc5705b4a3cc7132a227] = true; //rr

ambassadors_[0x6ca6ef7be51b9504fdcd98ef11908a41d9555dc9] = true; //ms

ambassadors_[0x1af7a66440af07e8c31526f5b921e480792f3c5f] = true; //ol

ambassadors_[0x798ce730e70f26624924011e1fac8a821d0ff0e7] = true; //we

ambassadors_[0x059d0f67c2d4c18b09c2b91ff13a4648a19d68a2] = true; //nb

ambassadors_[0x575850eb0bad2ef3d153d60b6e768c7648c4daeb] = true; //ho

ambassadors_[0xe3de1731a6d018e2dcd0ad233c870c4aac8e0d54] = true; //pm

ambassadors_[0x49b2bf937ca3f7029e2b1b1aa8445c8497da6464] = true; //tp

ambassadors_[0xc99868aaa529ebc4c2d7f6e97efc0d883ddbbeec] = true; //sr

ambassadors_[0x558d94edc943e0b4dd75001bc91750711e5c8239] = true; //lj

ambassadors_[0xd87dd0cd32e1076c52d87175da74a98ece6794a0] = true; //mh

ambassadors_[0xde24622f20c56cbf1a3ab75d078ebe42da7ed7b9] = true; //kb

ambassadors_[0x65d24fffaeb0b49a5bfbaf0ad7c180d61d012312] = true; //ta

// arc - pentesting, contract auditing.

ambassadors_[0x3a0cca1A832644B60730E5D4c27947C5De609d62] = true;

// sumpunk - contract auditing.

ambassadors_[0x7ac74Fcc1a71b106F12c55ee8F802C9F672Ce40C] = true;

// randall - charts & sheets, data dissector, advisor.

ambassadors_[0x2b219C2178f099dE4E9A3667d5cCc2cc64da0763] = true;

// ambius - 3d chart visualization.

ambassadors_[0x2A04C7335f90a6bd4e9c4F713DD792200e27F2E6] = true;

// contributors that need to remain private out of security concerns.

ambassadors_[0x35668818ba8F768D4C21787a6f45C86C69394dfD] = true; //dp

ambassadors_[0xa3120da52e604aC3Fc80A63813Ef15476e0B6AbD] = true; //tc

ambassadors_[0x924E71bA600372e2410285423F1Fe66799b717EC] = true; //ja

ambassadors_[0x6Ed450e062C20F929CB7Ee72fCc53e9697980a18] = true; //sf

ambassadors_[0x18864A6682c8EB79EEA5B899F11bC94ef9a85ADb] = true; //tb

ambassadors_[0x9cC1BdC994b7a847705D19106287C0BF94EF04B5] = true; //sm

ambassadors_[0x6926572813ec1438088963f208C61847df435a74] = true; //mc

ambassadors_[0xE16Ab764a02Ae03681E351Ac58FE79717c0eE8C6] = true; //et

ambassadors_[0x276F4a79F22D1BfC51Bd8dc5b27Bfd934C823932] = true; //sn

ambassadors_[0xA2b4ed3E2f4beF09FB35101B76Ef4cB9D3eeCaCf] = true; //bt

ambassadors_[0x147fc6b04c95BCE47D013c8d7a200ee434323669] = true; //al

}

/**

* Converts all incoming ethereum to tokens for the caller, and passes down the referral addy (if any)

function buy(address _referredBy)

public

payable

returns(uint256)

{

purchaseTokens(msg.value, _referredBy);

}

/**

* Fallback function to handle ethereum that was send straight to the contract

* Unfortunately we cannot use a referral address this way.

function()

payable

public

{

purchaseTokens(msg.value, 0x0);

}

/**

* Converts all of caller's dividends to tokens.

function reinvest()

onlyStronghands()

public

{

// fetch dividends

uint256 _dividends = myDividends(false); // retrieve ref. bonus later in the code

// pay out the dividends virtually

address _customerAddress = msg.sender;

payoutsTo_[_customerAddress] += (int256) (_dividends * magnitude);

// retrieve ref. bonus

_dividends += referralBalance_[_customerAddress];

referralBalance_[_customerAddress] = 0;

// dispatch a buy order with the virtualized "withdrawn dividends"

uint256 _tokens = purchaseTokens(_dividends, 0x0);

// fire event

onReinvestment(_customerAddress, _dividends, _tokens);

}

/**

* Alias of sell() and withdraw().

function exit()

public

{

// get token count for caller & sell them all

address _customerAddress = msg.sender;

uint256 _tokens = tokenBalanceLedger_[_customerAddress];

if(_tokens > 0) sell(_tokens);

// lambo delivery service

withdraw();

}

/**

* Withdraws all of the callers earnings.

function withdraw()

onlyStronghands()

public

{

// setup data

address _customerAddress = msg.sender;

uint256 _dividends = myDividends(false); // get ref. bonus later in the code

// update dividend tracker

payoutsTo_[_customerAddress] += (int256) (_dividends * magnitude);

// add ref. bonus

_dividends += referralBalance_[_customerAddress];

referralBalance_[_customerAddress] = 0;

// lambo delivery service

_customerAddress.transfer(_dividends);

// fire event

onWithdraw(_customerAddress, _dividends);

}

/**

* Liquifies tokens to ethereum.

function sell(uint256 _amountOfTokens)

onlyBagholders()

public

{

// setup data

address _customerAddress = msg.sender;

// russian hackers BTFO

require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);

uint256 _tokens = _amountOfTokens;

uint256 _ethereum = tokensToEthereum_(_tokens);

uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);

uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);

// burn the sold tokens

tokenSupply_ = SafeMath.sub(tokenSupply_, _tokens);

tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _tokens);

// update dividends tracker

int256 _updatedPayouts = (int256) (profitPerShare_ * _tokens + (_taxedEthereum * magnitude));

payoutsTo_[_customerAddress] -= _updatedPayouts;

// dividing by zero is a bad idea

if (tokenSupply_ > 0) {

// update the amount of dividends per token

profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);

}

// fire event

onTokenSell(_customerAddress, _tokens, _taxedEthereum);

}

/**

* Transfer tokens from the caller to a new holder.

* Remember, there's a 10% fee here as well.

function transfer(address _toAddress, uint256 _amountOfTokens)

onlyBagholders()

public

returns(bool)

{

// setup

address _customerAddress = msg.sender;

// make sure we have the requested tokens

// also disables transfers until ambassador phase is over

// ( we dont want whale premines )

require(!onlyAmbassadors && _amountOfTokens <= tokenBalanceLedger_[_customerAddress]);

// withdraw all outstanding dividends first

if(myDividends(true) > 0) withdraw();

// liquify 10% of the tokens that are transfered

// these are dispersed to shareholders

uint256 _tokenFee = SafeMath.div(_amountOfTokens, dividendFee_);

uint256 _taxedTokens = SafeMath.sub(_amountOfTokens, _tokenFee);

uint256 _dividends = tokensToEthereum_(_tokenFee);

// burn the fee tokens

tokenSupply_ = SafeMath.sub(tokenSupply_, _tokenFee);

// exchange tokens

tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _amountOfTokens);

tokenBalanceLedger_[_toAddress] = SafeMath.add(tokenBalanceLedger_[_toAddress], _taxedTokens);

// update dividend trackers

payoutsTo_[_customerAddress] -= (int256) (profitPerShare_ * _amountOfTokens);

payoutsTo_[_toAddress] += (int256) (profitPerShare_ * _taxedTokens);

// disperse dividends among holders

profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);

// fire event

Transfer(_customerAddress, _toAddress, _taxedTokens);

// ERC20

return true;

}

/*---------- ADMINISTRATOR ONLY FUNCTIONS ----------*/

/**

* In case the amassador quota is not met, the administrator can manually disable the ambassador phase.

function disableInitialStage()

onlyAdministrator()

public

{

onlyAmbassadors = false;

}

/**

* In case one of us dies, we need to replace ourselves.

function setAdministrator(bytes32 _identifier, bool _status)

onlyAdministrator()

public

{

administrators[_identifier] = _status;

}

/**

* Precautionary measures in case we need to adjust the masternode rate.

function setStakingRequirement(uint256 _amountOfTokens)

onlyAdministrator()

public

{

stakingRequirement = _amountOfTokens;

}

/**

* If we want to rebrand, we can.

function setName(string _name)

onlyAdministrator()

public

{

name = _name;

}

/**

* If we want to rebrand, we can.

function setSymbol(string _symbol)

onlyAdministrator()

public

{

symbol = _symbol;

}

/*---------- HELPERS AND CALCULATORS ----------*/

/**

* Method to view the current Ethereum stored in the contract

* Example: totalEthereumBalance()

function totalEthereumBalance()

public

view

returns(uint)

{

return this.balance;

}

/**

* Retrieve the total token supply.

function totalSupply()

public

view

returns(uint256)

{

return tokenSupply_;

}

/**

* Retrieve the tokens owned by the caller.

function myTokens()

public

view

returns(uint256)

{

address _customerAddress = msg.sender;

return balanceOf(_customerAddress);

}

/**

* Retrieve the dividends owned by the caller.

* If `_includeReferralBonus` is to to 1/true, the referral bonus will be included in the calculations.

* The reason for this, is that in the frontend, we will want to get the total divs (global + ref)

* But in the internal calculations, we want them separate.

function myDividends(bool _includeReferralBonus)

public

view

returns(uint256)

{

address _customerAddress = msg.sender;

return _includeReferralBonus ? dividendsOf(_customerAddress) + referralBalance_[_customerAddress] : dividendsOf(_customerAddress) ;

}

/**

* Retrieve the token balance of any single address.

function balanceOf(address _customerAddress)

view

public

returns(uint256)

{

return tokenBalanceLedger_[_customerAddress];

}

/**

* Retrieve the dividend balance of any single address.

function dividendsOf(address _customerAddress)

view

public

returns(uint256)

{

return (uint256) ((int256)(profitPerShare_ * tokenBalanceLedger_[_customerAddress]) - payoutsTo_[_customerAddress]) / magnitude;

}

/**

* Return the buy price of 1 individual token.

function sellPrice()

public

view

returns(uint256)

{

// our calculation relies on the token supply, so we need supply. Doh.

if(tokenSupply_ == 0){

return tokenPriceInitial_ - tokenPriceIncremental_;

} else {

uint256 _ethereum = tokensToEthereum_(1e18);

uint256 _dividends = SafeMath.div(_ethereum, dividendFee_ );

uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);

return _taxedEthereum;

}

/**

* Return the sell price of 1 individual token.

function buyPrice()

public

view

returns(uint256)

{

// our calculation relies on the token supply, so we need supply. Doh.

if(tokenSupply_ == 0){

return tokenPriceInitial_ + tokenPriceIncremental_;

} else {

uint256 _ethereum = tokensToEthereum_(1e18);

uint256 _dividends = SafeMath.div(_ethereum, dividendFee_ );

uint256 _taxedEthereum = SafeMath.add(_ethereum, _dividends);

return _taxedEthereum;

}

/**

* Function for the frontend to dynamically retrieve the price scaling of buy orders.

function calculateTokensReceived(uint256 _ethereumToSpend)

public

view

returns(uint256)

{

uint256 _dividends = SafeMath.div(_ethereumToSpend, dividendFee_);

uint256 _taxedEthereum = SafeMath.sub(_ethereumToSpend, _dividends);

uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);

return _amountOfTokens;

}

/**

* Function for the frontend to dynamically retrieve the price scaling of sell orders.

function calculateEthereumReceived(uint256 _tokensToSell)

public

view

returns(uint256)

{

require(_tokensToSell <= tokenSupply_);

uint256 _ethereum = tokensToEthereum_(_tokensToSell);

uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);

uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);

return _taxedEthereum;

}

/*==========================================

= INTERNAL FUNCTIONS =

==========================================*/

function purchaseTokens(uint256 _incomingEthereum, address _referredBy)

antiEarlyWhale(_incomingEthereum)

internal

returns(uint256)

{

// data setup

address _customerAddress = msg.sender;

uint256 _undividedDividends = SafeMath.div(_incomingEthereum, dividendFee_);

uint256 _referralBonus = SafeMath.div(_undividedDividends, 3);

uint256 _dividends = SafeMath.sub(_undividedDividends, _referralBonus);

uint256 _taxedEthereum = SafeMath.sub(_incomingEthereum, _undividedDividends);

uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);

uint256 _fee = _dividends * magnitude;

// no point in continuing execution if OP is a poorfag russian hacker

// prevents overflow in the case that the pyramid somehow magically starts being used by everyone in the world

// (or hackers)

// and yes we know that the safemath function automatically rules out the "greater then" equasion.

require(_amountOfTokens > 0 && (SafeMath.add(_amountOfTokens,tokenSupply_) > tokenSupply_));

// is the user referred by a masternode?

if(

// is this a referred purchase?

_referredBy != 0x0000000000000000000000000000000000000000 &&

// no cheating!

_referredBy != _customerAddress &&

// does the referrer have at least X whole tokens?

// i.e is the referrer a godly chad masternode

tokenBalanceLedger_[_referredBy] >= stakingRequirement

){

// wealth redistribution

referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], _referralBonus);

} else {

// no ref purchase

// add the referral bonus back to the global dividends cake

_dividends = SafeMath.add(_dividends, _referralBonus);

_fee = _dividends * magnitude;

}

// we can't give people infinite ethereum

if(tokenSupply_ > 0){

// add tokens to the pool

tokenSupply_ = SafeMath.add(tokenSupply_, _amountOfTokens);

// take the amount of dividends gained through this transaction, and allocates them evenly to each shareholder

profitPerShare_ += (_dividends * magnitude / (tokenSupply_));

// calculate the amount of tokens the customer receives over his purchase

_fee = _fee - (_fee-(_amountOfTokens * (_dividends * magnitude / (tokenSupply_))));

} else {

// add tokens to the pool

tokenSupply_ = _amountOfTokens;

}

// update circulating supply & the ledger address for the customer

tokenBalanceLedger_[_customerAddress] = SafeMath.add(tokenBalanceLedger_[_customerAddress], _amountOfTokens);

// Tells the contract that the buyer doesn't deserve dividends for the tokens before they owned them;

//really i know you think you do but you don't

int256 _updatedPayouts = (int256) ((profitPerShare_ * _amountOfTokens) - _fee);

payoutsTo_[_customerAddress] += _updatedPayouts;

// fire event

onTokenPurchase(_customerAddress, _incomingEthereum, _amountOfTokens, _referredBy);

return _amountOfTokens;

}

/**

* Calculate Token price based on an amount of incoming ethereum

* It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;

* Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.

function ethereumToTokens_(uint256 _ethereum)

internal

view

returns(uint256)

{

uint256 _tokenPriceInitial = tokenPriceInitial_ * 1e18;

uint256 _tokensReceived =

(

// underflow attempts BTFO

SafeMath.sub(

(sqrt

(

(_tokenPriceInitial**2)

(2*(tokenPriceIncremental_ * 1e18)*(_ethereum * 1e18))

(((tokenPriceIncremental_)**2)*(tokenSupply_**2))

(2*(tokenPriceIncremental_)*_tokenPriceInitial*tokenSupply_)

)

), _tokenPriceInitial

)

)/(tokenPriceIncremental_)

)-(tokenSupply_)

;

return _tokensReceived;

}

/**

* Calculate token sell value.

* It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;

* Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.

function tokensToEthereum_(uint256 _tokens)

internal

view

returns(uint256)

{

uint256 tokens_ = (_tokens + 1e18);

uint256 _tokenSupply = (tokenSupply_ + 1e18);

uint256 _etherReceived =

(

// underflow attempts BTFO

SafeMath.sub(

(

tokenPriceInitial_ +(tokenPriceIncremental_ * (_tokenSupply/1e18))

)-tokenPriceIncremental_

)*(tokens_ - 1e18)

),(tokenPriceIncremental_*((tokens_**2-tokens_)/1e18))/2

)

/1e18);

return _etherReceived;

}

//This is where all your gas goes, sorry

//Not sorry, you probably only paid 1 gwei

function sqrt(uint x) internal pure returns (uint y) {

uint z = (x + 1) / 2;

y = x;

while (z < y) {

y = z;

z = (x / z + z) / 2;

}

/**

* @title SafeMath

* @dev Math operations with safety checks that throw on error

library SafeMath {

/**

* @dev Mul

Saved diffs

Original text

Open file

pragma solidity ^0.4.20;

/*
* Team JUST presents..
* ====================================*
* _____     _ _ _ _____    ___ ____   * 
*|  _  |___| | | |  |  |  |_  |    \  *
*|   __| . | | | |     |  |_  |  |  | * 
*|__|  |___|_____|__|__|  |___|____/  *
*                                     *
* ====================================*
* -> What?
* The original autonomous pyramid, improved:
* [x] More stable than ever, having withstood severe testnet abuse and attack attempts from our community!.
* [x] Audited, tested, and approved by known community security specialists such as tocsick and Arc.
* [X] New functionality; you can now perform partial sell orders. If you succumb to weak hands, you don't have to dump all of your bags!
* [x] New functionality; you can now transfer tokens between wallets. Trading is now possible from within the contract!
* [x] New Feature: PoS Masternodes! The first implementation of Ethereum Staking in the world! Vitalik is mad.
* [x] Masternodes: Holding 100 PoWH3D Tokens allow you to generate a Masternode link, Masternode links are used as unique entry points to the contract!
* [x] Masternodes: All players who enter the contract through your Masternode have 30% of their 10% dividends fee rerouted from the master-node, to the node-master!
*
* -> What about the last projects?
* Every programming member of the old dev team has been fired and/or killed by 232.
* The new dev team consists of seasoned, professional developers and has been audited by veteran solidity experts.
* Additionally, two independent testnet iterations have been used by hundreds of people; not a single point of failure was found.
* 
* -> Who worked on this project?
* - PonziBot (math/memes/main site/master)
* - Mantso (lead solidity dev/lead web3 dev)
* - swagg (concept design/feedback/management)
* - Anonymous#1 (main site/web3/test cases)
* - Anonymous#2 (math formulae/whitepaper)
*
* -> Who has audited & approved the projected:
* - Arc
* - tocisck
* - sumpunk
*/

contract Hourglass {
    /*=================================
    =            MODIFIERS            =
    =================================*/
    // only people with tokens
    modifier onlyBagholders() {
        require(myTokens() > 0);
        _;
    }
    
    // only people with profits
    modifier onlyStronghands() {
        require(myDividends(true) > 0);
        _;
    }
    
    // administrators can:
    // -> change the name of the contract
    // -> change the name of the token
    // -> change the PoS difficulty (How many tokens it costs to hold a masternode, in case it gets crazy high later)
    // they CANNOT:
    // -> take funds
    // -> disable withdrawals
    // -> kill the contract
    // -> change the price of tokens
    modifier onlyAdministrator(){
        address _customerAddress = msg.sender;
        require(administrators[keccak256(_customerAddress)]);
        _;
    }
    
    
    // ensures that the first tokens in the contract will be equally distributed
    // meaning, no divine dump will be ever possible
    // result: healthy longevity.
    modifier antiEarlyWhale(uint256 _amountOfEthereum){
        address _customerAddress = msg.sender;
        
        // are we still in the vulnerable phase?
        // if so, enact anti early whale protocol 
        if( onlyAmbassadors && ((totalEthereumBalance() - _amountOfEthereum) <= ambassadorQuota_ )){
            require(
                // is the customer in the ambassador list?
                ambassadors_[_customerAddress] == true &&
                
                // does the customer purchase exceed the max ambassador quota?
                (ambassadorAccumulatedQuota_[_customerAddress] + _amountOfEthereum) <= ambassadorMaxPurchase_
                
            );
            
            // updated the accumulated quota    
            ambassadorAccumulatedQuota_[_customerAddress] = SafeMath.add(ambassadorAccumulatedQuota_[_customerAddress], _amountOfEthereum);
        
            // execute
            _;
        } else {
            // in case the ether count drops low, the ambassador phase won't reinitiate
            onlyAmbassadors = false;
            _;    
        }
        
    }
    
    
    /*==============================
    =            EVENTS            =
    ==============================*/
    event onTokenPurchase(
        address indexed customerAddress,
        uint256 incomingEthereum,
        uint256 tokensMinted,
        address indexed referredBy
    );
    
    event onTokenSell(
        address indexed customerAddress,
        uint256 tokensBurned,
        uint256 ethereumEarned
    );
    
    event onReinvestment(
        address indexed customerAddress,
        uint256 ethereumReinvested,
        uint256 tokensMinted
    );
    
    event onWithdraw(
        address indexed customerAddress,
        uint256 ethereumWithdrawn
    );
    
    // ERC20
    event Transfer(
        address indexed from,
        address indexed to,
        uint256 tokens
    );
    
    
    /*=====================================
    =            CONFIGURABLES            =
    =====================================*/
    string public name = "PowH3D";
    string public symbol = "P3D";
    uint8 constant public decimals = 18;
    uint8 constant internal dividendFee_ = 10;
    uint256 constant internal tokenPriceInitial_ = 0.0000001 ether;
    uint256 constant internal tokenPriceIncremental_ = 0.00000001 ether;
    uint256 constant internal magnitude = 2**64;
    
    // proof of stake (defaults at 100 tokens)
    uint256 public stakingRequirement = 100e18;
    
    // ambassador program
    mapping(address => bool) internal ambassadors_;
    uint256 constant internal ambassadorMaxPurchase_ = 1 ether;
    uint256 constant internal ambassadorQuota_ = 20 ether;
    
    
    
   /*================================
    =            DATASETS            =
    ================================*/
    // amount of shares for each address (scaled number)
    mapping(address => uint256) internal tokenBalanceLedger_;
    mapping(address => uint256) internal referralBalance_;
    mapping(address => int256) internal payoutsTo_;
    mapping(address => uint256) internal ambassadorAccumulatedQuota_;
    uint256 internal tokenSupply_ = 0;
    uint256 internal profitPerShare_;
    
    // administrator list (see above on what they can do)
    mapping(bytes32 => bool) public administrators;
    
    // when this is set to true, only ambassadors can purchase tokens (this prevents a whale premine, it ensures a fairly distributed upper pyramid)
    bool public onlyAmbassadors = true;
    


    /*=======================================
    =            PUBLIC FUNCTIONS            =
    =======================================*/
    /*
    * -- APPLICATION ENTRY POINTS --  
    */
    function Hourglass()
        public
    {
        // add administrators here
        administrators[0xdd8bb99b13fe33e1c32254dfb8fff3e71193f6b730a89dd33bfe5dedc6d83002] = true;
        
        // add the ambassadors here.
        // mantso - lead solidity dev & lead web dev. 
        ambassadors_[0x8b4DA1827932D71759687f925D17F81Fc94e3A9D] = true;
        
        // ponzibot - mathematics & website, and undisputed meme god.
        ambassadors_[0x8e0d985f3Ec1857BEc39B76aAabDEa6B31B67d53] = true;
        
        // swagg - concept design, feedback, management.
        ambassadors_[0x7563A35d5610eE7c9CD330E255Da0e779a644C19] = true;
        
        // k-dawgz - shilling machine, meme maestro, bizman.
        ambassadors_[0x215e3C713BADb158A457e61f99325bBB5d278E57] = true;
        
        // elmojo - all those pretty .GIFs & memes you see? you can thank this man for that.
        ambassadors_[0xaFF8B5CDCB339eEf5e1100597740a394C7B9c6cA] = true;
        
        // capex - community moderator.
        ambassadors_[0x8dc6569c28521560EAF1890bC41b2F3FC2010E1b] = true;
        
        // jörmungandr - pentests & twitter trendsetter.
        ambassadors_[0xf14BE3662FE4c9215c27698166759Db6967De94f] = true;
        
        // inventor - the source behind the non-intrusive referral model.
        ambassadors_[0x18E90Fc6F70344f53EBd4f6070bf6Aa23e2D748C] = true;
        
        // tocsick - pentesting, contract auditing.
        ambassadors_[0x49Aae4D923207e80Fc91E626BCb6532502264dfC] = true;
        
        // arc - pentesting, contract auditing.
        ambassadors_[0x3a0cca1A832644B60730E5D4c27947C5De609d62] = true;
        
        // sumpunk - contract auditing.
        ambassadors_[0x7ac74Fcc1a71b106F12c55ee8F802C9F672Ce40C] = true;
        
        // randall - charts & sheets, data dissector, advisor.
        ambassadors_[0x2b219C2178f099dE4E9A3667d5cCc2cc64da0763] = true;
        
        // ambius - 3d chart visualization.
        ambassadors_[0x2A04C7335f90a6bd4e9c4F713DD792200e27F2E6] = true;
        
        // contributors that need to remain private out of security concerns.
        ambassadors_[0x35668818ba8F768D4C21787a6f45C86C69394dfD] = true; //dp
        ambassadors_[0xa3120da52e604aC3Fc80A63813Ef15476e0B6AbD] = true; //tc
        ambassadors_[0x924E71bA600372e2410285423F1Fe66799b717EC] = true; //ja
        ambassadors_[0x6Ed450e062C20F929CB7Ee72fCc53e9697980a18] = true; //sf
        ambassadors_[0x18864A6682c8EB79EEA5B899F11bC94ef9a85ADb] = true; //tb
        ambassadors_[0x9cC1BdC994b7a847705D19106287C0BF94EF04B5] = true; //sm
        ambassadors_[0x6926572813ec1438088963f208C61847df435a74] = true; //mc
        ambassadors_[0xE16Ab764a02Ae03681E351Ac58FE79717c0eE8C6] = true; //et
        ambassadors_[0x276F4a79F22D1BfC51Bd8dc5b27Bfd934C823932] = true; //sn
        ambassadors_[0xA2b4ed3E2f4beF09FB35101B76Ef4cB9D3eeCaCf] = true; //bt
        ambassadors_[0x147fc6b04c95BCE47D013c8d7a200ee434323669] = true; //al
        

    }
    
     
    /**
     * Converts all incoming ethereum to tokens for the caller, and passes down the referral addy (if any)
     */
    function buy(address _referredBy)
        public
        payable
        returns(uint256)
    {
        purchaseTokens(msg.value, _referredBy);
    }
    
    /**
     * Fallback function to handle ethereum that was send straight to the contract
     * Unfortunately we cannot use a referral address this way.
     */
    function()
        payable
        public
    {
        purchaseTokens(msg.value, 0x0);
    }
    
    /**
     * Converts all of caller's dividends to tokens.
     */
    function reinvest()
        onlyStronghands()
        public
    {
        // fetch dividends
        uint256 _dividends = myDividends(false); // retrieve ref. bonus later in the code
        
        // pay out the dividends virtually
        address _customerAddress = msg.sender;
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);
        
        // retrieve ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;
        
        // dispatch a buy order with the virtualized "withdrawn dividends"
        uint256 _tokens = purchaseTokens(_dividends, 0x0);
        
        // fire event
        onReinvestment(_customerAddress, _dividends, _tokens);
    }
    
    /**
     * Alias of sell() and withdraw().
     */
    function exit()
        public
    {
        // get token count for caller & sell them all
        address _customerAddress = msg.sender;
        uint256 _tokens = tokenBalanceLedger_[_customerAddress];
        if(_tokens > 0) sell(_tokens);
        
        // lambo delivery service
        withdraw();
    }

    /**
     * Withdraws all of the callers earnings.
     */
    function withdraw()
        onlyStronghands()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        uint256 _dividends = myDividends(false); // get ref. bonus later in the code
        
        // update dividend tracker
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);
        
        // add ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;
        
        // lambo delivery service
        _customerAddress.transfer(_dividends);
        
        // fire event
        onWithdraw(_customerAddress, _dividends);
    }
    
    /**
     * Liquifies tokens to ethereum.
     */
    function sell(uint256 _amountOfTokens)
        onlyBagholders()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        // russian hackers BTFO
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        uint256 _tokens = _amountOfTokens;
        uint256 _ethereum = tokensToEthereum_(_tokens);
        uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
        
        // burn the sold tokens
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokens);
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _tokens);
        
        // update dividends tracker
        int256 _updatedPayouts = (int256) (profitPerShare_ * _tokens + (_taxedEthereum * magnitude));
        payoutsTo_[_customerAddress] -= _updatedPayouts;       
        
        // dividing by zero is a bad idea
        if (tokenSupply_ > 0) {
            // update the amount of dividends per token
            profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
        }
        
        // fire event
        onTokenSell(_customerAddress, _tokens, _taxedEthereum);
    }
    
    
    /**
     * Transfer tokens from the caller to a new holder.
     * Remember, there's a 10% fee here as well.
     */
    function transfer(address _toAddress, uint256 _amountOfTokens)
        onlyBagholders()
        public
        returns(bool)
    {
        // setup
        address _customerAddress = msg.sender;
        
        // make sure we have the requested tokens
        // also disables transfers until ambassador phase is over
        // ( we dont want whale premines )
        require(!onlyAmbassadors && _amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        
        // withdraw all outstanding dividends first
        if(myDividends(true) > 0) withdraw();
        
        // liquify 10% of the tokens that are transfered
        // these are dispersed to shareholders
        uint256 _tokenFee = SafeMath.div(_amountOfTokens, dividendFee_);
        uint256 _taxedTokens = SafeMath.sub(_amountOfTokens, _tokenFee);
        uint256 _dividends = tokensToEthereum_(_tokenFee);
  
        // burn the fee tokens
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokenFee);

        // exchange tokens
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        tokenBalanceLedger_[_toAddress] = SafeMath.add(tokenBalanceLedger_[_toAddress], _taxedTokens);
        
        // update dividend trackers
        payoutsTo_[_customerAddress] -= (int256) (profitPerShare_ * _amountOfTokens);
        payoutsTo_[_toAddress] += (int256) (profitPerShare_ * _taxedTokens);
        
        // disperse dividends among holders
        profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
        
        // fire event
        Transfer(_customerAddress, _toAddress, _taxedTokens);
        
        // ERC20
        return true;
       
    }
    
    /*----------  ADMINISTRATOR ONLY FUNCTIONS  ----------*/
    /**
     * In case the amassador quota is not met, the administrator can manually disable the ambassador phase.
     */
    function disableInitialStage()
        onlyAdministrator()
        public
    {
        onlyAmbassadors = false;
    }
    
    /**
     * In case one of us dies, we need to replace ourselves.
     */
    function setAdministrator(bytes32 _identifier, bool _status)
        onlyAdministrator()
        public
    {
        administrators[_identifier] = _status;
    }
    
    /**
     * Precautionary measures in case we need to adjust the masternode rate.
     */
    function setStakingRequirement(uint256 _amountOfTokens)
        onlyAdministrator()
        public
    {
        stakingRequirement = _amountOfTokens;
    }
    
    /**
     * If we want to rebrand, we can.
     */
    function setName(string _name)
        onlyAdministrator()
        public
    {
        name = _name;
    }
    
    /**
     * If we want to rebrand, we can.
     */
    function setSymbol(string _symbol)
        onlyAdministrator()
        public
    {
        symbol = _symbol;
    }

    
    /*----------  HELPERS AND CALCULATORS  ----------*/
    /**
     * Method to view the current Ethereum stored in the contract
     * Example: totalEthereumBalance()
     */
    function totalEthereumBalance()
        public
        view
        returns(uint)
    {
        return this.balance;
    }
    
    /**
     * Retrieve the total token supply.
     */
    function totalSupply()
        public
        view
        returns(uint256)
    {
        return tokenSupply_;
    }
    
    /**
     * Retrieve the tokens owned by the caller.
     */
    function myTokens()
        public
        view
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return balanceOf(_customerAddress);
    }
    
    /**
     * Retrieve the dividends owned by the caller.
     * If `_includeReferralBonus` is to to 1/true, the referral bonus will be included in the calculations.
     * The reason for this, is that in the frontend, we will want to get the total divs (global + ref)
     * But in the internal calculations, we want them separate. 
     */ 
    function myDividends(bool _includeReferralBonus) 
        public 
        view 
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return _includeReferralBonus ? dividendsOf(_customerAddress) + referralBalance_[_customerAddress] : dividendsOf(_customerAddress) ;
    }
    
    /**
     * Retrieve the token balance of any single address.
     */
    function balanceOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return tokenBalanceLedger_[_customerAddress];
    }
    
    /**
     * Retrieve the dividend balance of any single address.
     */
    function dividendsOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return (uint256) ((int256)(profitPerShare_ * tokenBalanceLedger_[_customerAddress]) - payoutsTo_[_customerAddress]) / magnitude;
    }
    
    /**
     * Return the buy price of 1 individual token.
     */
    function sellPrice() 
        public 
        view 
        returns(uint256)
    {
        // our calculation relies on the token supply, so we need supply. Doh.
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ - tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(_ethereum, dividendFee_  );
            uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
            return _taxedEthereum;
        }
    }
    
    /**
     * Return the sell price of 1 individual token.
     */
    function buyPrice() 
        public 
        view 
        returns(uint256)
    {
        // our calculation relies on the token supply, so we need supply. Doh.
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ + tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(_ethereum, dividendFee_  );
            uint256 _taxedEthereum = SafeMath.add(_ethereum, _dividends);
            return _taxedEthereum;
        }
    }
    
    /**
     * Function for the frontend to dynamically retrieve the price scaling of buy orders.
     */
    function calculateTokensReceived(uint256 _ethereumToSpend) 
        public 
        view 
        returns(uint256)
    {
        uint256 _dividends = SafeMath.div(_ethereumToSpend, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereumToSpend, _dividends);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        
        return _amountOfTokens;
    }
    
    /**
     * Function for the frontend to dynamically retrieve the price scaling of sell orders.
     */
    function calculateEthereumReceived(uint256 _tokensToSell) 
        public 
        view 
        returns(uint256)
    {
        require(_tokensToSell <= tokenSupply_);
        uint256 _ethereum = tokensToEthereum_(_tokensToSell);
        uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
        return _taxedEthereum;
    }
    
    
    /*==========================================
    =            INTERNAL FUNCTIONS            =
    ==========================================*/
    function purchaseTokens(uint256 _incomingEthereum, address _referredBy)
        antiEarlyWhale(_incomingEthereum)
        internal
        returns(uint256)
    {
        // data setup
        address _customerAddress = msg.sender;
        uint256 _undividedDividends = SafeMath.div(_incomingEthereum, dividendFee_);
        uint256 _referralBonus = SafeMath.div(_undividedDividends, 3);
        uint256 _dividends = SafeMath.sub(_undividedDividends, _referralBonus);
        uint256 _taxedEthereum = SafeMath.sub(_incomingEthereum, _undividedDividends);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        uint256 _fee = _dividends * magnitude;
 
        // no point in continuing execution if OP is a poorfag russian hacker
        // prevents overflow in the case that the pyramid somehow magically starts being used by everyone in the world
        // (or hackers)
        // and yes we know that the safemath function automatically rules out the "greater then" equasion.
        require(_amountOfTokens > 0 && (SafeMath.add(_amountOfTokens,tokenSupply_) > tokenSupply_));
        
        // is the user referred by a masternode?
        if(
            // is this a referred purchase?
            _referredBy != 0x0000000000000000000000000000000000000000 &&

            // no cheating!
            _referredBy != _customerAddress &&
            
            // does the referrer have at least X whole tokens?
            // i.e is the referrer a godly chad masternode
            tokenBalanceLedger_[_referredBy] >= stakingRequirement
        ){
            // wealth redistribution
            referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], _referralBonus);
        } else {
            // no ref purchase
            // add the referral bonus back to the global dividends cake
            _dividends = SafeMath.add(_dividends, _referralBonus);
            _fee = _dividends * magnitude;
        }
        
        // we can't give people infinite ethereum
        if(tokenSupply_ > 0){
            
            // add tokens to the pool
            tokenSupply_ = SafeMath.add(tokenSupply_, _amountOfTokens);
 
            // take the amount of dividends gained through this transaction, and allocates them evenly to each shareholder
            profitPerShare_ += (_dividends * magnitude / (tokenSupply_));
            
            // calculate the amount of tokens the customer receives over his purchase 
            _fee = _fee - (_fee-(_amountOfTokens * (_dividends * magnitude / (tokenSupply_))));
        
        } else {
            // add tokens to the pool
            tokenSupply_ = _amountOfTokens;
        }
        
        // update circulating supply & the ledger address for the customer
        tokenBalanceLedger_[_customerAddress] = SafeMath.add(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        
        // Tells the contract that the buyer doesn't deserve dividends for the tokens before they owned them;
        //really i know you think you do but you don't
        int256 _updatedPayouts = (int256) ((profitPerShare_ * _amountOfTokens) - _fee);
        payoutsTo_[_customerAddress] += _updatedPayouts;
        
        // fire event
        onTokenPurchase(_customerAddress, _incomingEthereum, _amountOfTokens, _referredBy);
        
        return _amountOfTokens;
    }

    /**
     * Calculate Token price based on an amount of incoming ethereum
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
    function ethereumToTokens_(uint256 _ethereum)
        internal
        view
        returns(uint256)
    {
        uint256 _tokenPriceInitial = tokenPriceInitial_ * 1e18;
        uint256 _tokensReceived = 
         (
            (
                // underflow attempts BTFO
                SafeMath.sub(
                    (sqrt
                        (
                            (_tokenPriceInitial**2)
                            +
                            (2*(tokenPriceIncremental_ * 1e18)*(_ethereum * 1e18))
                            +
                            (((tokenPriceIncremental_)**2)*(tokenSupply_**2))
                            +
                            (2*(tokenPriceIncremental_)*_tokenPriceInitial*tokenSupply_)
                        )
                    ), _tokenPriceInitial
                )
            )/(tokenPriceIncremental_)
        )-(tokenSupply_)
        ;
  
        return _tokensReceived;
    }
    
    /**
     * Calculate token sell value.
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
     function tokensToEthereum_(uint256 _tokens)
        internal
        view
        returns(uint256)
    {

        uint256 tokens_ = (_tokens + 1e18);
        uint256 _tokenSupply = (tokenSupply_ + 1e18);
        uint256 _etherReceived =
        (
            // underflow attempts BTFO
            SafeMath.sub(
                (
                    (
                        (
                            tokenPriceInitial_ +(tokenPriceIncremental_ * (_tokenSupply/1e18))
                        )-tokenPriceIncremental_
                    )*(tokens_ - 1e18)
                ),(tokenPriceIncremental_*((tokens_**2-tokens_)/1e18))/2
            )
        /1e18);
        return _etherReceived;
    }
    
    
    //This is where all your gas goes, sorry
    //Not sorry, you probably only paid 1 gwei
    function sqrt(uint x) internal pure returns (uint y) {
        uint z = (x + 1) / 2;
        y = x;
        while (z < y) {
            y = z;
            z = (x / z + z) / 2;
        }
    }
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    /**
    * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

Changed text

Open file

pragma solidity ^0.4.20;

/*
* Team JUST presents..
* ====================================*
*  _____   ______          ___        *
* |  __ \ / __ \ \        / / |       *
* | |__) | |  | \ \  /\  / /| |       *
* |  ___/| |  | |\ \/  \/ / | |       *
* | |    | |__| | \  /\  /  | |____   *
* |_|     \____/   \/  \/   |______|  *
* ====================================*
* -> What?
* This source code is copy of Proof of Weak Hands (POWH3D)
* Only difference is that, you will receive 20% dividends.
* Call us copycats coz we love cats :)
*/

contract Hourglass {
    /*=================================
    =            MODIFIERS            =
    =================================*/
    // only people with tokens
    modifier onlyBagholders() {
        require(myTokens() > 0);
        _;
    }
    
    // only people with profits
    modifier onlyStronghands() {
        require(myDividends(true) > 0);
        _;
    }
    
    // administrators can:
    // -> change the name of the contract
    // -> change the name of the token
    // -> change the PoS difficulty (How many tokens it costs to hold a masternode, in case it gets crazy high later)
    // they CANNOT:
    // -> take funds
    // -> disable withdrawals
    // -> kill the contract
    // -> change the price of tokens
    modifier onlyAdministrator(){
        address _customerAddress = msg.sender;
        require(administrators[keccak256(_customerAddress)]);
        _;
    }
    
    
    // ensures that the first tokens in the contract will be equally distributed
    // meaning, no divine dump will be ever possible
    // result: healthy longevity.
    modifier antiEarlyWhale(uint256 _amountOfEthereum){
        address _customerAddress = msg.sender;
        
        // are we still in the vulnerable phase?
        // if so, enact anti early whale protocol 
        if( onlyAmbassadors && ((totalEthereumBalance() - _amountOfEthereum) <= ambassadorQuota_ )){
            require(
                // is the customer in the ambassador list?
                ambassadors_[_customerAddress] == true &&
                
                // does the customer purchase exceed the max ambassador quota?
                (ambassadorAccumulatedQuota_[_customerAddress] + _amountOfEthereum) <= ambassadorMaxPurchase_
                
            );
            
            // updated the accumulated quota    
            ambassadorAccumulatedQuota_[_customerAddress] = SafeMath.add(ambassadorAccumulatedQuota_[_customerAddress], _amountOfEthereum);
        
            // execute
            _;
        } else {
            // in case the ether count drops low, the ambassador phase won't reinitiate
            onlyAmbassadors = false;
            _;    
        }
        
    }
    
    
    /*==============================
    =            EVENTS            =
    ==============================*/
    event onTokenPurchase(
        address indexed customerAddress,
        uint256 incomingEthereum,
        uint256 tokensMinted,
        address indexed referredBy
    );
    
    event onTokenSell(
        address indexed customerAddress,
        uint256 tokensBurned,
        uint256 ethereumEarned
    );
    
    event onReinvestment(
        address indexed customerAddress,
        uint256 ethereumReinvested,
        uint256 tokensMinted
    );
    
    event onWithdraw(
        address indexed customerAddress,
        uint256 ethereumWithdrawn
    );
    
    // ERC20
    event Transfer(
        address indexed from,
        address indexed to,
        uint256 tokens
    );
    
    
    /*=====================================
    =            CONFIGURABLES            =
    =====================================*/
    string public name = "POWL";
    string public symbol = "POWL";
    uint8 constant public decimals = 18;
    uint8 constant internal dividendFee_ = 20;
    uint256 constant internal tokenPriceInitial_ = 0.0000001 ether;
    uint256 constant internal tokenPriceIncremental_ = 0.00000001 ether;
    uint256 constant internal magnitude = 2**64;
    
    // proof of stake (defaults at 100 tokens)
    uint256 public stakingRequirement = 100e18;
    
    // ambassador program
    mapping(address => bool) internal ambassadors_;
    uint256 constant internal ambassadorMaxPurchase_ = 1 ether;
    uint256 constant internal ambassadorQuota_ = 20 ether;
    
    
    
   /*================================
    =            DATASETS            =
    ================================*/
    // amount of shares for each address (scaled number)
    mapping(address => uint256) internal tokenBalanceLedger_;
    mapping(address => uint256) internal referralBalance_;
    mapping(address => int256) internal payoutsTo_;
    mapping(address => uint256) internal ambassadorAccumulatedQuota_;
    uint256 internal tokenSupply_ = 0;
    uint256 internal profitPerShare_;
    
    // administrator list (see above on what they can do)
    mapping(bytes32 => bool) public administrators;
    
    // when this is set to true, only ambassadors can purchase tokens (this prevents a whale premine, it ensures a fairly distributed upper pyramid)
    bool public onlyAmbassadors = true;
    


    /*=======================================
    =            PUBLIC FUNCTIONS            =
    =======================================*/
    /*
    * -- APPLICATION ENTRY POINTS --  
    */
    function Hourglass()
        public
    {
        // add administrators here
        administrators[0x909b33773fe2c245e253e4d2403e3edd353517c30bc1a85b98d78b392e5fd2c1] = true;
        
        // add the ambassadors here.
        // rackoo - lead solidity dev & lead web dev. 
        ambassadors_[0xbe3569068562218c792cf25b98dbf1418aff2455] = true;
        
        // noncy - Aunt responsible for feeding us.
        ambassadors_[0x17b88dc23dacf6a905356a342a0d88f055a52f07] = true;
        
        //tipso - ctrl+c and ctrl+v expert
        ambassadors_[0xda335f08bec7d84018628c4c9e18c7ef076d8c30] = true;
        
        //powl chat - chat expert
        ambassadors_[0x99d63938007553c3ec9ce032cd94c3655360c197] = true;
        
        //pipper - shiller
        ambassadors_[0x3595072a72390aa733f9389d61e384b89122fff6] = true;
        
        //vai - Solidity newbie
        ambassadors_[0x575850eb0bad2ef3d153d60b6e768c7648c4daeb] = true;
        
        //sudpe - Developer
        ambassadors_[0x80622cb543e2ec10bf210756b0f5fa819a945409] = true; //ho
        
        
        //private dudes
        ambassadors_[0x8cba9adeb6db06980d9efa38ccf8c50ec1a44335] = true; //ml
        ambassadors_[0x8c77aab3bf3b55786cb168223b66fbcac1add480] = true; //of
        ambassadors_[0x54c7cd8969b8e64be047a9808e417e43e7336f00] = true; //kd
        ambassadors_[0xe9d3a8cd1a7738c52ea1dc5705b4a3cc7132a227] = true; //rr
        ambassadors_[0x6ca6ef7be51b9504fdcd98ef11908a41d9555dc9] = true; //ms
        ambassadors_[0x1af7a66440af07e8c31526f5b921e480792f3c5f] = true; //ol
        ambassadors_[0x798ce730e70f26624924011e1fac8a821d0ff0e7] = true; //we
        ambassadors_[0x059d0f67c2d4c18b09c2b91ff13a4648a19d68a2] = true; //nb
        ambassadors_[0x575850eb0bad2ef3d153d60b6e768c7648c4daeb] = true; //ho
        ambassadors_[0xe3de1731a6d018e2dcd0ad233c870c4aac8e0d54] = true; //pm
        ambassadors_[0x49b2bf937ca3f7029e2b1b1aa8445c8497da6464] = true; //tp
        ambassadors_[0xc99868aaa529ebc4c2d7f6e97efc0d883ddbbeec] = true; //sr
        ambassadors_[0x558d94edc943e0b4dd75001bc91750711e5c8239] = true; //lj
        ambassadors_[0xd87dd0cd32e1076c52d87175da74a98ece6794a0] = true; //mh
        ambassadors_[0xde24622f20c56cbf1a3ab75d078ebe42da7ed7b9] = true; //kb
        ambassadors_[0x65d24fffaeb0b49a5bfbaf0ad7c180d61d012312] = true; //ta
        
        

    }
    
     
    /**
     * Converts all incoming ethereum to tokens for the caller, and passes down the referral addy (if any)
     */
    function buy(address _referredBy)
        public
        payable
        returns(uint256)
    {
        purchaseTokens(msg.value, _referredBy);
    }
    
    /**
     * Fallback function to handle ethereum that was send straight to the contract
     * Unfortunately we cannot use a referral address this way.
     */
    function()
        payable
        public
    {
        purchaseTokens(msg.value, 0x0);
    }
    
    /**
     * Converts all of caller's dividends to tokens.
     */
    function reinvest()
        onlyStronghands()
        public
    {
        // fetch dividends
        uint256 _dividends = myDividends(false); // retrieve ref. bonus later in the code
        
        // pay out the dividends virtually
        address _customerAddress = msg.sender;
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);
        
        // retrieve ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;
        
        // dispatch a buy order with the virtualized "withdrawn dividends"
        uint256 _tokens = purchaseTokens(_dividends, 0x0);
        
        // fire event
        onReinvestment(_customerAddress, _dividends, _tokens);
    }
    
    /**
     * Alias of sell() and withdraw().
     */
    function exit()
        public
    {
        // get token count for caller & sell them all
        address _customerAddress = msg.sender;
        uint256 _tokens = tokenBalanceLedger_[_customerAddress];
        if(_tokens > 0) sell(_tokens);
        
        // lambo delivery service
        withdraw();
    }

    /**
     * Withdraws all of the callers earnings.
     */
    function withdraw()
        onlyStronghands()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        uint256 _dividends = myDividends(false); // get ref. bonus later in the code
        
        // update dividend tracker
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);
        
        // add ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;
        
        // lambo delivery service
        _customerAddress.transfer(_dividends);
        
        // fire event
        onWithdraw(_customerAddress, _dividends);
    }
    
    /**
     * Liquifies tokens to ethereum.
     */
    function sell(uint256 _amountOfTokens)
        onlyBagholders()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        // russian hackers BTFO
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        uint256 _tokens = _amountOfTokens;
        uint256 _ethereum = tokensToEthereum_(_tokens);
        uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
        
        // burn the sold tokens
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokens);
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _tokens);
        
        // update dividends tracker
        int256 _updatedPayouts = (int256) (profitPerShare_ * _tokens + (_taxedEthereum * magnitude));
        payoutsTo_[_customerAddress] -= _updatedPayouts;       
        
        // dividing by zero is a bad idea
        if (tokenSupply_ > 0) {
            // update the amount of dividends per token
            profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
        }
        
        // fire event
        onTokenSell(_customerAddress, _tokens, _taxedEthereum);
    }
    
    
    /**
     * Transfer tokens from the caller to a new holder.
     * Remember, there's a 10% fee here as well.
     */
    function transfer(address _toAddress, uint256 _amountOfTokens)
        onlyBagholders()
        public
        returns(bool)
    {
        // setup
        address _customerAddress = msg.sender;
        
        // make sure we have the requested tokens
        // also disables transfers until ambassador phase is over
        // ( we dont want whale premines )
        require(!onlyAmbassadors && _amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        
        // withdraw all outstanding dividends first
        if(myDividends(true) > 0) withdraw();
        
        // liquify 10% of the tokens that are transfered
        // these are dispersed to shareholders
        uint256 _tokenFee = SafeMath.div(_amountOfTokens, dividendFee_);
        uint256 _taxedTokens = SafeMath.sub(_amountOfTokens, _tokenFee);
        uint256 _dividends = tokensToEthereum_(_tokenFee);
  
        // burn the fee tokens
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokenFee);

        // exchange tokens
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        tokenBalanceLedger_[_toAddress] = SafeMath.add(tokenBalanceLedger_[_toAddress], _taxedTokens);
        
        // update dividend trackers
        payoutsTo_[_customerAddress] -= (int256) (profitPerShare_ * _amountOfTokens);
        payoutsTo_[_toAddress] += (int256) (profitPerShare_ * _taxedTokens);
        
        // disperse dividends among holders
        profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
        
        // fire event
        Transfer(_customerAddress, _toAddress, _taxedTokens);
        
        // ERC20
        return true;
       
    }
    
    /*----------  ADMINISTRATOR ONLY FUNCTIONS  ----------*/
    /**
     * In case the amassador quota is not met, the administrator can manually disable the ambassador phase.
     */
    function disableInitialStage()
        onlyAdministrator()
        public
    {
        onlyAmbassadors = false;
    }
    
    /**
     * In case one of us dies, we need to replace ourselves.
     */
    function setAdministrator(bytes32 _identifier, bool _status)
        onlyAdministrator()
        public
    {
        administrators[_identifier] = _status;
    }
    
    /**
     * Precautionary measures in case we need to adjust the masternode rate.
     */
    function setStakingRequirement(uint256 _amountOfTokens)
        onlyAdministrator()
        public
    {
        stakingRequirement = _amountOfTokens;
    }
    
    /**
     * If we want to rebrand, we can.
     */
    function setName(string _name)
        onlyAdministrator()
        public
    {
        name = _name;
    }
    
    /**
     * If we want to rebrand, we can.
     */
    function setSymbol(string _symbol)
        onlyAdministrator()
        public
    {
        symbol = _symbol;
    }

    
    /*----------  HELPERS AND CALCULATORS  ----------*/
    /**
     * Method to view the current Ethereum stored in the contract
     * Example: totalEthereumBalance()
     */
    function totalEthereumBalance()
        public
        view
        returns(uint)
    {
        return this.balance;
    }
    
    /**
     * Retrieve the total token supply.
     */
    function totalSupply()
        public
        view
        returns(uint256)
    {
        return tokenSupply_;
    }
    
    /**
     * Retrieve the tokens owned by the caller.
     */
    function myTokens()
        public
        view
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return balanceOf(_customerAddress);
    }
    
    /**
     * Retrieve the dividends owned by the caller.
     * If `_includeReferralBonus` is to to 1/true, the referral bonus will be included in the calculations.
     * The reason for this, is that in the frontend, we will want to get the total divs (global + ref)
     * But in the internal calculations, we want them separate. 
     */ 
    function myDividends(bool _includeReferralBonus) 
        public 
        view 
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return _includeReferralBonus ? dividendsOf(_customerAddress) + referralBalance_[_customerAddress] : dividendsOf(_customerAddress) ;
    }
    
    /**
     * Retrieve the token balance of any single address.
     */
    function balanceOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return tokenBalanceLedger_[_customerAddress];
    }
    
    /**
     * Retrieve the dividend balance of any single address.
     */
    function dividendsOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return (uint256) ((int256)(profitPerShare_ * tokenBalanceLedger_[_customerAddress]) - payoutsTo_[_customerAddress]) / magnitude;
    }
    
    /**
     * Return the buy price of 1 individual token.
     */
    function sellPrice() 
        public 
        view 
        returns(uint256)
    {
        // our calculation relies on the token supply, so we need supply. Doh.
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ - tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(_ethereum, dividendFee_  );
            uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
            return _taxedEthereum;
        }
    }
    
    /**
     * Return the sell price of 1 individual token.
     */
    function buyPrice() 
        public 
        view 
        returns(uint256)
    {
        // our calculation relies on the token supply, so we need supply. Doh.
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ + tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(_ethereum, dividendFee_  );
            uint256 _taxedEthereum = SafeMath.add(_ethereum, _dividends);
            return _taxedEthereum;
        }
    }
    
    /**
     * Function for the frontend to dynamically retrieve the price scaling of buy orders.
     */
    function calculateTokensReceived(uint256 _ethereumToSpend) 
        public 
        view 
        returns(uint256)
    {
        uint256 _dividends = SafeMath.div(_ethereumToSpend, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereumToSpend, _dividends);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        
        return _amountOfTokens;
    }
    
    /**
     * Function for the frontend to dynamically retrieve the price scaling of sell orders.
     */
    function calculateEthereumReceived(uint256 _tokensToSell) 
        public 
        view 
        returns(uint256)
    {
        require(_tokensToSell <= tokenSupply_);
        uint256 _ethereum = tokensToEthereum_(_tokensToSell);
        uint256 _dividends = SafeMath.div(_ethereum, dividendFee_);
        uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
        return _taxedEthereum;
    }
    
    
    /*==========================================
    =            INTERNAL FUNCTIONS            =
    ==========================================*/
    function purchaseTokens(uint256 _incomingEthereum, address _referredBy)
        antiEarlyWhale(_incomingEthereum)
        internal
        returns(uint256)
    {
        // data setup
        address _customerAddress = msg.sender;
        uint256 _undividedDividends = SafeMath.div(_incomingEthereum, dividendFee_);
        uint256 _referralBonus = SafeMath.div(_undividedDividends, 3);
        uint256 _dividends = SafeMath.sub(_undividedDividends, _referralBonus);
        uint256 _taxedEthereum = SafeMath.sub(_incomingEthereum, _undividedDividends);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        uint256 _fee = _dividends * magnitude;
 
        // no point in continuing execution if OP is a poorfag russian hacker
        // prevents overflow in the case that the pyramid somehow magically starts being used by everyone in the world
        // (or hackers)
        // and yes we know that the safemath function automatically rules out the "greater then" equasion.
        require(_amountOfTokens > 0 && (SafeMath.add(_amountOfTokens,tokenSupply_) > tokenSupply_));
        
        // is the user referred by a masternode?
        if(
            // is this a referred purchase?
            _referredBy != 0x0000000000000000000000000000000000000000 &&

            // no cheating!
            _referredBy != _customerAddress &&
            
            // does the referrer have at least X whole tokens?
            // i.e is the referrer a godly chad masternode
            tokenBalanceLedger_[_referredBy] >= stakingRequirement
        ){
            // wealth redistribution
            referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], _referralBonus);
        } else {
            // no ref purchase
            // add the referral bonus back to the global dividends cake
            _dividends = SafeMath.add(_dividends, _referralBonus);
            _fee = _dividends * magnitude;
        }
        
        // we can't give people infinite ethereum
        if(tokenSupply_ > 0){
            
            // add tokens to the pool
            tokenSupply_ = SafeMath.add(tokenSupply_, _amountOfTokens);
 
            // take the amount of dividends gained through this transaction, and allocates them evenly to each shareholder
            profitPerShare_ += (_dividends * magnitude / (tokenSupply_));
            
            // calculate the amount of tokens the customer receives over his purchase 
            _fee = _fee - (_fee-(_amountOfTokens * (_dividends * magnitude / (tokenSupply_))));
        
        } else {
            // add tokens to the pool
            tokenSupply_ = _amountOfTokens;
        }
        
        // update circulating supply & the ledger address for the customer
        tokenBalanceLedger_[_customerAddress] = SafeMath.add(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        
        // Tells the contract that the buyer doesn't deserve dividends for the tokens before they owned them;
        //really i know you think you do but you don't
        int256 _updatedPayouts = (int256) ((profitPerShare_ * _amountOfTokens) - _fee);
        payoutsTo_[_customerAddress] += _updatedPayouts;
        
        // fire event
        onTokenPurchase(_customerAddress, _incomingEthereum, _amountOfTokens, _referredBy);
        
        return _amountOfTokens;
    }

    /**
     * Calculate Token price based on an amount of incoming ethereum
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
    function ethereumToTokens_(uint256 _ethereum)
        internal
        view
        returns(uint256)
    {
        uint256 _tokenPriceInitial = tokenPriceInitial_ * 1e18;
        uint256 _tokensReceived = 
         (
            (
                // underflow attempts BTFO
                SafeMath.sub(
                    (sqrt
                        (
                            (_tokenPriceInitial**2)
                            +
                            (2*(tokenPriceIncremental_ * 1e18)*(_ethereum * 1e18))
                            +
                            (((tokenPriceIncremental_)**2)*(tokenSupply_**2))
                            +
                            (2*(tokenPriceIncremental_)*_tokenPriceInitial*tokenSupply_)
                        )
                    ), _tokenPriceInitial
                )
            )/(tokenPriceIncremental_)
        )-(tokenSupply_)
        ;
  
        return _tokensReceived;
    }
    
    /**
     * Calculate token sell value.
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
     function tokensToEthereum_(uint256 _tokens)
        internal
        view
        returns(uint256)
    {

        uint256 tokens_ = (_tokens + 1e18);
        uint256 _tokenSupply = (tokenSupply_ + 1e18);
        uint256 _etherReceived =
        (
            // underflow attempts BTFO
            SafeMath.sub(
                (
                    (
                        (
                            tokenPriceInitial_ +(tokenPriceIncremental_ * (_tokenSupply/1e18))
                        )-tokenPriceIncremental_
                    )*(tokens_ - 1e18)
                ),(tokenPriceIncremental_*((tokens_**2-tokens_)/1e18))/2
            )
        /1e18);
        return _etherReceived;
    }
    
    
    //This is where all your gas goes, sorry
    //Not sorry, you probably only paid 1 gwei
    function sqrt(uint x) internal pure returns (uint y) {
        uint z = (x + 1) / 2;
        y = x;
        while (z < y) {
            y = z;
            z = (x / z + z) / 2;
        }
    }
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    /**
    * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}