using System;

public class Program

{

    interface IA{

        void put();

        void pull();

    }

    interface IB{

        void leave();

    }

    class fuse

    {

        protected int x,y,z;

    }

    class megafuse:fuse,IA,IB

    {

        public void put(){

            Console.Write("Number 1: ");

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

            Console.Write("Number 2: ");

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

        }

        public void pull(){

            z=x+y;

            Console.WriteLine("N1: "+x+"\nN2: "+y+"\nSum: "+z);

        }

        public void leave(){

            Console.WriteLine("Goodbye");

        }

    }

    public static void Main()

    {

        megafuse m = new megafuse();

        m.put();

        m.pull();

        m.leave();

    }

}