using System;

public class Program

{

    public static void Main()

    {

            Console.WriteLine("въведи час");

        var number = int.Parse(Console.ReadLine());

        if (number <= 10)

        {

            Console.WriteLine("good morning");

        }

        else if (number <= 19)

        {

            Console.WriteLine("good day");

        }

        else

        {

            Console.WriteLine("good night");

        }

    }

}