contract ERC20Interface {
      // Get the total token supply
      function totalSupply() constant returns (uint256 totalSupply);
   
      // Get the account balance of another account with address _owner
      function balanceOf(address _owner) constant returns (uint256 balance);
   
      // Send _value amount of tokens to address _to
      function transfer(address _to, uint256 _value) returns (bool success);
   
      // Send _value amount of tokens from address _from to address _to
      function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
   
      // Allow _spender to withdraw from your account, multiple times, up to the _value amount.
      // If this function is called again it overwrites the current allowance with _value.
      // this function is required for some DEX functionality
      function approve(address _spender, uint256 _value) returns (bool success);
   
      // Returns the amount which _spender is still allowed to withdraw from _owner
      function allowance(address _owner, address _spender) constant returns (uint256 remaining);
   
      // Triggered when tokens are transferred.
      event Transfer(address indexed _from, address indexed _to, uint256 _value);
   
      // Triggered whenever approve(address _spender, uint256 _value) is called.
      event Approval(address indexed _owner, address indexed _spender, uint256 _value);
  }
function totalSupply() constant returns (uint256 totalSupply);
// Get the total token supply