using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter a guess, positive whole numbers only.");

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

        if (guess==18)

        Console.WriteLine("Congratulations, you win!");

        else if(guess<18 && guess>=0)

        Console.WriteLine("Pick a higher number.");

        else if(guess>18)

        Console.WriteLine("Pick a lower number.");

        else

        {Console.WriteLine("Please enter a valid number.");

        Console.WriteLine("Try again");

        }

    }

}