在C#中计数任意大的正整数

using System;
using System.Numerics;

class Program
{
    static void Main(string[] args)
    {
        BigInteger bigInteger = BigInteger.Parse("123456789012345678901234567890");
        Console.WriteLine("BigInteger: " + bigInteger);

        BigInteger incremented = bigInteger + 1;
        Console.WriteLine("Incremented: " + incremented);
    }
}