pragma solidity ^0.4.0;

contract DragonStone {

       address public creator;
       mapping(address => uint) balances;

       event Delivered(address from, address to, uint amount);

       constructor() public{
           creator = msg.sender;
       }

       function create(address receiver, uint amount) public {
            if(msg.sender !=creator) return;
              balances[receiver] = amount;
       }

       function transfer(address receiver, uint amount) public {
              if(balances[msg.sender] < amount) return;
                balances[msg.sender] -= amount;
                balances[receiver] += amount;
                emit Delivered(msg.sender, receiver, amount);
       }
}