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 contract SafeMath    - function safeAdd(uint a, uint b)    - function safeSub(uint a, uint b)    - function safeMul(uint a, uint b)    - function safeDiv(uint a, uint b)  contract ERC20Interface    - function totalSupply()    - function balanceOf(address tokenOwner ...    - function allowance(address tokenOwner ...    - function transfer(address to, uint to ...    - function approve(address spender, uin ...    - function transferFrom(address from, a ...  contract ApproveAndCallFallBack    - function receiveApproval(address from ...  contract Owned  contract VXV is ERC20Interface, Ow ... *    - function changeRate(uint newRate)    - function totalSupply()    - function balanceOf(address tokenOwner ...    - function transferInternal(address fro ...    - function transfer(address to, uint to ...    - function transferFrom(address from, a ...    - function approve(address spender, uin ...    - function allowance(address tokenOwner ...    - function approveAndCall(address spend ...    - function ()

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/**
 *Submitted for verification at Etherscan.io on 2018-10-02
*/
pragma solidity ^0.4.24;
contract SafeMath {
    function safeAdd(uint a, uint b) public pure returns (uint c) {
        c = a + b;
        require(c >= a);
    }
    function safeSub(uint a, uint b) public pure returns (uint c) {
        require(b <= a);
        c = a - b;
    }
    function safeMul(uint a, uint b) public pure returns (uint c) {
        c = a * b;
        require(a == 0 || c / a == b);
    }
    function safeDiv(uint a, uint b) public pure returns (uint c) {
        require(b > 0);
        c = a / b;
    }
}
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