using System;

public class Program

{

    public static void Main()

    { int m = int.Parse(Console.ReadLine());

     if (m==2)

     {Console.WriteLine("28 ili 29 dni");}

     else 

     { if ( m==4||m==6||m==9||m==11 )

     {Console.WriteLine("30 dni");}

     else 

     {Console.WriteLine("31 dni");}

     }

    }

}