using System;

public class Program

{

    public static void Main()

    {

        int ch;

        Console.WriteLine("Hello World");

        ch = Convert.ToInt32(Console.ReadLine());

        while(ch!=4){

        Console.WriteLine("MAIN MENU");

        Console.WriteLine("1. ");

        Console.WriteLine("2. ");

        Console.WriteLine("3. ");

        Console.WriteLine("4. EXIT");

        }

    }

}