using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace No188
{
    public class Program
    {
        public static void Main(string[] args)
        {
            DateTime n = new DateTime(2015, 1, 1);
            DateTime end = new DateTime(2015, 12, 31);
            int count = 0;

            while(n <= end )
            {
                string day = n.Day.ToString("00");
                int d0 = int.Parse(day[0].ToString());
                int d1 = int.Parse(day[1].ToString());

                if (n.Month == d0 + d1)
                {
                    count++;
                }
                n = n.AddDays(1);
            }

            Console.WriteLine(count);
        }
    }
}