using System;

public class Program

{

    public int add(int a,int b,out int sub)

    {

     int addition=a+b;

    sub=a-b;

    return addition;

    }

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int a=10;

        int b=6;

        int sub;

        Program p=new Program();

            p.add(a ,b, out sub);

        int addition=p.add(a,b,out sub);

        Console.WriteLine(sub);

        Console.WriteLine(addition);

    }

}