using System;

public class Hello{
    public static void Main(){
        // Here your code !
        DateTime date = DateTime.Parse("2015/1/1");
        int Month;
        int wkDay;
        int answer = 0;
        
        for(int i = 0; i < 365; i++)
        {
            Month = date.Month;
            wkDay = int.Parse(date.ToString("dd").Substring(0,1)) + int.Parse(date.ToString("dd").Substring(1,1));
            if(Month == wkDay)
            {
                answer = answer + 1;
            }
            date = date.AddDays(1);
        }
        
        Console.WriteLine(answer);
        
    }
}