using System;

public class Program

{

    public static void Main(String[] args)

    {

        int mod(int a, int n)

{

    int result = a % n;

    if ((result<0 && n>0) || (result>0 && n<0)) {

        result += n;

    }

    return result;

}

        int firstnum, secondnum;

        Console.WriteLine("input firstnum");

        firstnum = int.Parse(Console.ReadLine());

        Console.WriteLine("input secondnum");

        secondnum = int.Parse(Console.ReadLine());

        Console.WriteLine("Expected Output: "+ firstnum + secondnum);

        Console.WriteLine("Expected Output: "+ firstnum - secondnum);

        Console.WriteLine("Expected Output: "+ firstnum * secondnum);

        Console.WriteLine("Expected Output: "+ firstnum / secondnum);

        Console.WriteLine(mod("Expected Output: "+ firstnum, secondnum));

    }

}