function buyJay(
        address[] calldata erc721TokenAddress,
        uint256[] calldata erc721Ids,
        address[] calldata erc1155TokenAddress,
        uint256[] calldata erc1155Ids,
        uint256[] calldata erc1155Amounts
    ) public payable {
        require(start, "Not started!");
        uint256 total = erc721TokenAddress.length;
        if (total != 0) buyJayWithERC721(erc721TokenAddress, erc721Ids);

        if (erc1155TokenAddress.length != 0)
            total = total.add(
                buyJayWithERC1155(
                    erc1155TokenAddress,
                    erc1155Ids,
                    erc1155Amounts
                )
            );

        if (total >= 100)
            require(
                msg.value >= (total).mul(sellNftFeeEth).div(2),
                "You need to pay ETH more"
            );
        else
            require(
                msg.value >= (total).mul(sellNftFeeEth),
                "You need to pay ETH more"
            );

        _mint(msg.sender, ETHtoJAY(msg.value).mul(97).div(100));

        (bool success, ) = dev.call{value: msg.value.div(34)}("");
        require(success, "ETH Transfer failed.");

        nftsSold += total;

        emit Price(block.timestamp, JAYtoETH(1 * 10**18));
    }

function ETHtoJAY(uint256 value) public view returns (uint256) {
    return value.mul(totalSupply()).div(address(this).balance.sub(value));
}

{
  "erc721TokenAddress": [
    "0xed42cb11b9d03c807ed1ba9c2ed1d3ba5bf37340"
  ],
  "erc721Ids": [
    "0"
  ],
  "erc1155TokenAddress": [],
  "erc1155Ids": [],
  "erc1155Amounts": []
}

function JAYtoETH(uint256 value) public view returns (uint256) {
    return (value * address(this).balance).div(totalSupply());
}