```\nfunction feed(uint256 intoReserves, uint256 intoGrandPrize)\n    external\n    payable\n    onlyOwner\n{\n    require(\n        msg.value > 0 && intoReserves.add(intoGrandPrize) == msg.value,\n        "DCBW721: Balance-Value Mismatch"\n    );\n    _updateGrandPrizePool(_grandPrizePool.add(intoGrandPrize));\n    _updateReserves(_reserves.add(intoReserves));\n}\n```\n