using System;
using System.Numerics;
public class Program
{
public static void Main()
BigInteger a = BigInteger.Parse("1234567890123456789012345678901234567890");
// ^ 10 ^ 20 ^ 30 ^ 40
BigInteger b = BigInteger.Parse("100000000000000000000000000000000");
Console.WriteLine($"a = {a}");
Console.WriteLine($"a + b = {a + b}");
}