using System;

public class Program

{

    public static void Main()

    {

        //Victoria Rodriguez Lopez

        int c;

        Console.WriteLine("Could you write a number higher than 20?, please.");

         do

         {

             Console.WriteLine("Give me the number.");

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

             if(c > 20)

             {

                 Console.WriteLine("Good job!");

             }

         while (c < 20)

         {

             Console.WriteLine("Could you write a number higher than 20?");

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

         }

         }

    }

}