using System;

public class Program

{

    public static void Main()

    {

        bool valid = true;

        int choise ; 

        while ( valid == true)

        {

            Console.WriteLine("What is 2 + 2");

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

            if (choise== 4)

            {

                valid == false;

            }

        }

    }

}