using System;

public class csharpExercise

{

    public static void Main(string[] args)

    {

    //Reading a month number from user

    Console.WriteLine("Enter month number(1-12): ");

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

    switch (num)

    {

        case 1: Console.WriteLine("31 days");

            break;

        case 2: Console.WriteLine("28 or 29 days");

            break;

        case 3: Console.WriteLine("31 days");

            break;

        case 4: Console.WriteLine("30 days");

            break;

        case 5: Console.WriteLine("31 days");

            break;

        case 6: Console.WriteLine("30 days");

            break;

        case 7: Console.WriteLine("31 days");

            break;

        case 8: Console.WriteLine("31 days");

            break;

        case 9: Console.WriteLine("30 days");

            break;

        case 10: Console.WriteLine("31 days");

            break;

        case 11: Console.WriteLine("30 days");

            break;

        case 12: Console.WriteLine("31 days");

            break;

        default:

            Console.WriteLine("Invalid input!!! enter month number between 1-12");

            break;

      }

    }

}