using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please tell me what 2 + 2 is");

        int ans = Convert.ToInt32(Console.ReadLine());

        {

            while (ans != 4)

                Console.WriteLine("Please try again");

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

            if (ans == 4)

                Console.WriteLine("well done");

        }

    }

}