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 contract DSNote  contract DSAuthority    - function canCall(address src, address ...  contract DSAuthEvents  contract DSAuth is DSAuthEvents    - function setOwner(address owner_)    - function setAuthority(DSAuthority aut ...    - function isAuthorized(address src, by ...  contract DSStop is DSAuth, DSNote    - function stop()    - function start()  contract DSMath    - function add(uint256 x, uint256 y)    - function sub(uint256 x, uint256 y)    - function mul(uint256 x, uint256 y)    - function div(uint256 x, uint256 y)    - function min(uint256 x, uint256 y)    - function max(uint256 x, uint256 y)    - function hadd(uint128 x, uint128 y)    - function hsub(uint128 x, uint128 y)    - function hmul(uint128 x, uint128 y)    - function hdiv(uint128 x, uint128 y)    - function hmin(uint128 x, uint128 y)    - function hmax(uint128 x, uint128 y)    - function imin(int256 x, int256 y)    - function imax(int256 x, int256 y)    - function wadd(uint128 x, uint128 y)    - function wsub(uint128 x, uint128 y)    - function wmul(uint128 x, uint128 y)    - function wdiv(uint128 x, uint128 y)    - function wmin(uint128 x, uint128 y)    - function wmax(uint128 x, uint128 y)    - function radd(uint128 x, uint128 y)    - function rsub(uint128 x, uint128 y)    - function rmul(uint128 x, uint128 y)    - function rdiv(uint128 x, uint128 y)    - function rpow(uint128 x, uint64 n)    - function rmin(uint128 x, uint128 y)    - function rmax(uint128 x, uint128 y)    - function cast(uint256 x)  contract ERC20    - function totalSupply()    - function balanceOf( address who )    - function allowance( address owner, ad ...    - function transfer( address to, uint v ...    - function transferFrom( address from, ...    - function approve( address spender, ui ...  contract DSTokenBase is ERC20, DSM ... *    - function totalSupply()    - function balanceOf(address src)    - function allowance(address src, addre ...    - function transfer(address dst, uint w ...    - function transferFrom(address src, ad ...    - function approve(address guy, uint256 ...  contract DSToken is DSTokenBase(0) ... *    - function transfer(address dst, uint w ...    - function transferFrom(    - function approve(address guy, uint wa ...    - function push(address dst, uint128 wa ...    - function pull(address src, uint128 wa ...    - function mint(uint128 wad)    - function burn(uint128 wad)

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/**
 *Submitted for verification at Etherscan.io on 2018-07-19
*/

pragma solidity ^0.4.24;
contract DSNote {
    event LogNote(
        bytes4   indexed  sig,
        address  indexed  guy,
        bytes32  indexed  foo,
        bytes32  indexed  bar,
        uint              wad,
        bytes             fax
    ) anonymous;

    modifier note {
        bytes32 foo;
        bytes32 bar;

        assembly {
            foo := calldataload(4)
            bar := calldataload(36)
        }

        emit LogNote(msg.sig, msg.sender, foo, bar, msg.value, msg.data);
        _;
    }
}

contract DSAuthority {
    function canCall(address src, address dst, bytes4 sig) public constant returns (bool);
}

contract DSAuthEvents {
    event LogSetAuthority (address indexed authority);
    event LogSetOwner     (address indexed owner);
}

contract DSAuth is DSAuthEvents {
    DSAuthority  public  authority;
    address      public  owner;

    constructor() public {
        owner = msg.sender;
        emit LogSetOwner(msg.sender);
    }

    function setOwner(address owner_) public auth 
    {
        require(owner_ != address(0));
        owner = owner_;
        emit LogSetOwner(owner);
    }

    function setAuthority(DSAuthority authority_) public auth
    {
        authority = authority_;
        emit LogSetAuthority(authority);
    }

    modifier auth {
        assert(isAuthorized(msg.sender, msg.sig));
        _;
    }

    modifier authorized(bytes4 sig) {
        assert(isAuthorized(msg.sender, sig));
        _;
    }

    function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
        if (src == address(this)) {
            return true;
        } else if (src == owner) {
            return true;
        } else if (authority == DSAuthority(0)) {
            return false;
        } else {
            return authority.canCall(src, this, sig);
        }
    }

    // function assert(bool x) internal pure{
    //     if (!x) revert();
    // }
}

contract DSStop is DSAuth, DSNote {

    bool public stopped;

    modifier stoppable {
        assert (!stopped);
        _;
    }
    function stop() public auth note {
        stopped = true;
    }
    function start() public auth note {
        stopped = false;
    }

}

contract DSMath {
    
    /*
    standard uint256 functions
     */

    function add(uint256 x, uint256 y) pure internal returns (uint256 z) {
        assert((z = x + y) >= x);
    }

    function sub(uint256 x, uint256 y) pure internal returns (uint256 z) {
        assert((z = x - y) <= x);
    }

    function mul(uint256 x, uint256 y) pure internal returns (uint256 z) {
        assert(y == 0 || (z = x * y) / y == x);
    }

    function div(uint256 x, uint256 y) pure internal returns (uint256 z) {
        z = x / y;
    }

    function min(uint256 x, uint256 y) pure internal returns (uint256 z) {
        return x <= y ? x : y;
    }
    function max(uint256 x, uint256 y) pure internal returns (uint256 z) {
        return x >= y ? x : y;
    }

    /*
    uint128 functions (h is for half)
     */


    function hadd(uint128 x, uint128 y) pure internal returns (uint128 z) {
        assert((z = x + y) >= x);
    }

    function hsub(uint128 x, uint128 y) pure internal returns (uint128 z) {
        assert((z = x - y) <= x);
    }

    function hmul(uint128 x, uint128 y) pure internal returns (uint128 z) {
        assert(y == 0 || (z = x * y) / y == x);
    }

    function hdiv(uint128 x, uint128 y) pure internal returns (uint128 z) {
        z = x / y;
    }

    function hmin(uint128 x, uint128 y) pure internal returns (uint128 z) {
        return x <= y ? x : y;
    }
    function hmax(uint128 x, uint128 y) pure internal returns (uint128 z) {
        return x >= y ? x : y;
    }


    /*
    int256 functions
     */

    function imin(int256 x, int256 y) pure internal returns (int256 z) {
        return x <= y ? x : y;
    }
    function imax(int256 x, int256 y) pure internal returns (int256 z) {
        return x >= y ? x : y;
    }

    /*
    WAD math
     */

    uint128 constant WAD = 10 ** 18;

    function wadd(uint128 x, uint128 y) pure internal returns (uint128) {
        return hadd(x, y);
    }

    function wsub(uint128 x, uint128 y) pure internal returns (uint128) {
        return hsub(x, y);
    }

    function wmul(uint128 x, uint128 y) pure internal returns (uint128 z) {
        z = cast(add(mul(uint256(x), y), WAD/2) / WAD);
    }

    function wdiv(uint128 x, uint128 y) pure internal returns (uint128 z) {
        z = cast(add(mul(uint256(x), WAD), y/2) / y);
    }

    function wmin(uint128 x, uint128 y) pure internal returns (uint128) {
        return hmin(x, y);
    }
    function wmax(uint128 x, uint128 y) pure internal returns (uint128) {
        return hmax(x, y);
    }

    /*
    RAY math
     */

    uint128 constant RAY = 10 ** 27;

    function radd(uint128 x, uint128 y) pure internal returns (uint128) {
        return hadd(x, y);
    }

    function rsub(uint128 x, uint128 y) pure internal returns (uint128) {
        return hsub(x, y);
    }

    function rmul(uint128 x, uint128 y) pure internal returns (uint128 z) {
        z = cast(add(mul(uint256(x), y), RAY/2) / RAY);
    }

    function rdiv(uint128 x, uint128 y) pure internal returns (uint128 z) {
        z = cast(add(mul(uint256(x), RAY), y/2) / y);
    }

    function rpow(uint128 x, uint64 n) pure internal returns (uint128 z) {
        // This famous algorithm is called "exponentiation by squaring"
        // and calculates x^n with x as fixed-point and n as regular unsigned.
        //
        // It's O(log n), instead of O(n) for naive repeated multiplication.
        //
        // These facts are why it works:
        //
        //  If n is even, then x^n = (x^2)^(n/2).
        //  If n is odd,  then x^n = x * x^(n-1),
        //   and applying the equation for even x gives
        //    x^n = x * (x^2)^((n-1) / 2).
        //
        //  Also, EVM division is flooring and
        //    floor[(n-1) / 2] = floor[n / 2].

        z = n % 2 != 0 ? x : RAY;

        for (n /= 2; n != 0; n /= 2) {
            x = rmul(x, x);

            if (n % 2 != 0) {
                z = rmul(z, x);
            }
        }
    }

    function rmin(uint128 x, uint128 y) pure internal returns (uint128) {
        return hmin(x, y);
    }
    function rmax(uint128 x, uint128 y) pure internal returns (uint128) {
        return hmax(x, y);
    }

    function cast(uint256 x) pure internal returns (uint128 z) {
        assert((z = uint128(x)) == x);
    }

}

contract ERC20 {
    function totalSupply() public view returns (uint supply);
    function balanceOf( address who ) public view returns (uint value);
    function allowance( address owner, address spender ) public view returns (uint _allowance);

    function transfer( address to, uint value) public returns (bool ok);
    function transferFrom( address from, address to, uint value) public returns (bool ok);
    function approve( address spender, uint value ) public returns (bool ok);

    event Transfer( address indexed from, address indexed to, uint value);
    event Approval( address indexed owner, address indexed spender, uint value);
}

contract DSTokenBase is ERC20, DSMath {
    uint256                                            _supply;
    mapping (address => uint256)                       _balances;
    mapping (address => mapping (address => uint256))  _approvals;
    
    constructor(uint256 supply) public{
        _balances[msg.sender] = supply;
        _supply = supply;
    }
    
    function totalSupply() public view returns (uint256) {
        return _supply;
    }
    function balanceOf(address src) public view returns (uint256) {
        return _balances[src];
    }
    function allowance(address src, address guy) public view returns (uint256) {
        return _approvals[src][guy];
    }
    
    function transfer(address dst, uint wad) public returns (bool) {
        assert(_balances[msg.sender] >= wad);
        
        _balances[msg.sender] = sub(_balances[msg.sender], wad);
        _balances[dst] = add(_balances[dst], wad);
        
        emit Transfer(msg.sender, dst, wad);
        
        return true;
    }
    
    function transferFrom(address src, address dst, uint wad) public returns (bool) {
        assert(_balances[src] >= wad);
        assert(_approvals[src][msg.sender] >= wad);
        
        _approvals[src][msg.sender] = sub(_approvals[src][msg.sender], wad);
        _balances[src] = sub(_balances[src], wad);
        _balances[dst] = add(_balances[dst], wad);
        
        emit Transfer(src, dst, wad);
        
        return true;
    }
    
    function approve(address guy, uint256 wad) public returns (bool) {
        _approvals[msg.sender][guy] = wad;
        
        emit Approval(msg.sender, guy, wad);
        
        return true;
    }

}

contract DSToken is DSTokenBase(0), DSStop {

    bytes32  public  symbol;
    bytes32  public  name;
    uint256  public  decimals = 18; // standard token precision. override to customize
    uint256  public  MAX_MINT_NUMBER = 1000*10**26;

    constructor(bytes32 symbol_, bytes32 name_) public{
        symbol = symbol_;
        name = name_;
    }

    function transfer(address dst, uint wad) public stoppable note returns (bool) {
        return super.transfer(dst, wad);
    }
    function transferFrom(
        address src, address dst, uint wad
    ) public stoppable note returns (bool) {
        return super.transferFrom(src, dst, wad);
    }
    function approve(address guy, uint wad) public stoppable note returns (bool) {
        return super.approve(guy, wad);
    }

    function push(address dst, uint128 wad) public returns (bool) {
        return transfer(dst, wad);
    }
    function pull(address src, uint128 wad) public returns (bool) {
        return transferFrom(src, msg.sender, wad);
    }

    function mint(uint128 wad) public auth stoppable note {
        assert (add(_supply, wad) <= MAX_MINT_NUMBER);
        _balances[msg.sender] = add(_balances[msg.sender], wad);
        _supply = add(_supply, wad);
    }
    function burn(uint128 wad) public auth stoppable note {
        _balances[msg.sender] = sub(_balances[msg.sender], wad);
        _supply = sub(_supply, wad);
    }
}

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