C# 存储超大的数字

 static void Main(string[] args)
        {
            //存储超大的数字
            System.Numerics.BigInteger numA = System.Numerics.BigInteger.Parse("9999999999999999999999999999999999999");
            System.Numerics.BigInteger numB = System.Numerics.BigInteger.Parse("7777777777777777777777777777777777777");
            //2个数相加
            System.Numerics.BigInteger numC = System.Numerics.BigInteger.Add(numA, numB);
            //2个数相减
            System.Numerics.BigInteger numD = System.Numerics.BigInteger.Subtract(numA, numB);
            //2个数相乘
            System.Numerics.BigInteger numE = System.Numerics.BigInteger.Multiply(numA, numB);
            //2个数相除
            System.Numerics.BigInteger numF = System.Numerics.BigInteger.Divide(numA, numB);
        }