pragma solidity ^0.4.10;


contract SafeMath {



    function safeAdd(uint256 x, uint256 y) internal returns(uint256) {
      uint256 z = x + y;
      assert((z >= x) && (z >= y));
      return z;
    }

    function safeSubtract(uint256 x, uint256 y) internal returns(uint256) {
      assert(x >= y);
      uint256 z = x - y;
      return z;
    }

    function safeMult(uint256 x, uint256 y) internal returns(uint256) {
      uint256 z = x * y;
      assert((x == 0)||(z/x == y));
      return z;
    }

}

contract Token {
    uint256 public totalSupply;
    function balanceOf(address _owner) constant returns  (uint256 balance);
    function transfer(address _to, uint256 _value) returns (bool success);
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
    function approve(address _spender, uint256 _value) returns (bool success);
    function allowance(address _owner, address _spender) constant returns (uint256 remaining);
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

}



contract StandardToken is Token , SafeMath {

    bool public status = true;
    modifier on() {
        require(status == true);
        _;
      }

    function transfer(address _to, uint256 _value) on returns (bool success) {
      if (balances[msg.sender] >= _value && _value > 0 && _to != 0X0) {
        balances[msg.sender] -= _value;
        balances[_to] = safeAdd(balances[_to],_value);
        Transfer(msg.sender, _to, _value);
        return true;
      } else {
        return false;
      }
    }

    function transferFrom(address _from, address _to, uint256 _value) on returns (bool success) {
      if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
        balances[_to] = safeAdd(balances[_to],_value);
        balances[_from] = safeSubtract(balances[_from],_value);
        allowed[_from][msg.sender] = safeSubtract(allowed[_from][msg.sender],_value);
        Transfer(_from, _to, _value);
        return true;
      } else {
        return false;
      }
    }

    function balanceOf(address _owner) on constant returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) on returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) on constant returns (uint256 remaining) {
      return allowed[_owner][_spender];
    }

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
}




    contract HDTToken is StandardToken {
      string public name = "Huobi Derivative Token";
      uint8 public decimals = 18;
      string public symbol = "HDT";
      bool private init =true;
      function turnon() controller {
        status = true;
      }
      function turnoff() controller {
        status = false;
      }
      function HDTToken() {
        require(init==true);
        totalSupply = 10000000000*10**18;
        balances[0x63155828e949AEbA75038a5e8a5F4EDd5038d9a6] = totalSupply;
        Transfer(0x0000000000000000000000000000000000000000, 0x63155828e949AEbA75038a5e8a5F4EDd5038d9a6, totalSupply);
        init = false;

      }
      address public controller1 =0x14de73a5602ee3769fb7a968daAFF23A4A6D4Bb5;
address public controller2 =0x3567cafb8bf2a83bbea4e79f3591142fb4ebe86d;

      modifier controller () {

        require(msg.sender == controller1||msg.sender == controller2);
        _;
      }
    }