using System;

public class Program

{

    // Pattarawadee Wongkamsai (MT) 

    public static void Main()

    {

        Console.Write("Input month number : ");

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

            if (number == 4 || number == 6 || number == 9 || number == 11)

            {

                Console.WriteLine("This month have 30 days");

            }

            else if (number == 1 || number == 3 || number == 5 || number == 7 || number == 8 || number == 10 || number == 12)

            {

                Console.WriteLine("This month have 31 days");

            }   

            else if (number == 2)    

            {

               Console.WriteLine("This month have 28 or 29 days");

            }   

            else

            {

                Console.WriteLine("-------------Error------------");

            }

        }

}