pragma solidity ^0.4.23;
/**
 *    A yearn.finance pegged base-money that is
 *  adaptive, transparent, and community-driven.
 *
 *           $$\     $$\ $$$$$$$$\ $$$$$$\ 
 *           \$$\   $$  |$$  _____|\_$$  _|
 *     $$$$$$\\$$\ $$  / $$ |        $$ |  
 *    $$  __$$\\$$$$  /  $$$$$\      $$ |  
 *    $$ /  $$ |\$$  /   $$  __|     $$ |  
 *    $$ |  $$ | $$ |    $$ |        $$ |  
 *    $$$$$$$  | $$ |    $$ |      $$$$$$\ 
 *    $$  ____/  \__|    \__|      \______|
 *    $$ |                                 
 *    $$ |                                 
 *    \__|                                 
 *
 *                              
 *         https://pyfi.finance/
 * 
**/

library SafeMath {

  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;
  }

  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 a / b;
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit Transfer(msg.sender, _to, _value);
    return true;
  }

  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }

}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) public view returns (uint256);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;

  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    emit Transfer(_from, _to, _value);
    return true;
  }

  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }

  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

contract MultiOwnable {
  address public root;
  mapping (address => address) public owners; // owner => parent of owner
  
  constructor() public {
    root = msg.sender;
    owners[root] = root;
  }
  
  modifier onlyOwner() {
    require(owners[msg.sender] != 0);
    _;
  }
  
  function newOwner(address _owner) onlyOwner external returns (bool) {
    require(_owner != 0);
    owners[_owner] = msg.sender;
    return true;
  }
  
  function deleteOwner(address _owner) onlyOwner external returns (bool) {
    require(owners[_owner] == msg.sender || (owners[_owner] != 0 && msg.sender == root));
    owners[_owner] = 0;
    return true;
  }
}

contract BurnableToken is BasicToken {

  event Burn(address indexed burner, uint256 value);

  function burn(uint256 _value) public {
    _burn(msg.sender, _value);
  }

  function _burn(address _who, uint256 _value) internal {
    require(_value <= balances[_who]);
    balances[_who] = balances[_who].sub(_value);
    totalSupply_ = totalSupply_.sub(_value);
    emit Burn(_who, _value);
    emit Transfer(_who, address(0), _value);
  }
}

contract Blacklisted is MultiOwnable {

  mapping(address => bool) public blacklist;

  modifier notBlacklisted() {
    require(blacklist[msg.sender] == false);
    _;
  }

  function addToBlacklist(address _villain) external onlyOwner {
    blacklist[_villain] = true;
  }

  function addManyToBlacklist(address[] _villains) external onlyOwner {
    for (uint256 i = 0; i < _villains.length; i++) {
      blacklist[_villains[i]] = true;
    }
  }

  function removeFromBlacklist(address _villain) external onlyOwner {
    blacklist[_villain] = false;
  }
}

contract MintableToken is StandardToken, MultiOwnable {
  event Mint(address indexed to, uint256 amount);
  event MintFinished();

  bool public mintingFinished = false;


  modifier canMint() {
    require(!mintingFinished);
    _;
  }

  function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
    totalSupply_ = totalSupply_.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    emit Mint(_to, _amount);
    emit Transfer(address(0), _to, _amount);
    return true;
  }


  function finishMinting() onlyOwner canMint public returns (bool) {
    mintingFinished = true;
    emit MintFinished();
    return true;
  }
}

contract KP5R is MintableToken, BurnableToken, Blacklisted {

  string public constant name = "pyfi.finance"; // solium-disable-line uppercase
  string public constant symbol = "KP5R"; // solium-disable-line uppercase
  uint8 public constant decimals = 18; // solium-disable-line uppercase, // 18 decimals is the strongly suggested default, avoid changing it

  uint256 public constant INITIAL_SUPPLY = 7 * 1000 * (10 ** uint256(decimals)); 

  bool public isUnlocked = false;
  

  constructor(address _wallet) public {
    _wallet =   0x50B948B380fcCf1a6E97A15cdf1AA3Aa974D7540;
    totalSupply_ = INITIAL_SUPPLY;
    balances[_wallet] = INITIAL_SUPPLY;
    emit Transfer(address(0), _wallet, INITIAL_SUPPLY);
  }

  modifier onlyTransferable() {
    require(isUnlocked || owners[msg.sender] != 0);
    _;
  }

  function transferFrom(address _from, address _to, uint256 _value) public onlyTransferable notBlacklisted returns (bool) {
      return super.transferFrom(_from, _to, _value);
  }

  function transfer(address _to, uint256 _value) public onlyTransferable notBlacklisted returns (bool) {
      return super.transfer(_to, _value);
  }
  
  function unlockTransfer() public onlyOwner {
      isUnlocked = true;
  }
  
  function lockTransfer() public onlyOwner {
      isUnlocked = false;
  }

}