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 )
            {
                var day = n.Day.ToString("00").ToArray().Select(s => int.Parse(s.ToString())).ToList();

                if (n.Month == day[0] + day[1])
                {
                    count++;
                }
                n = n.AddDays(1);
            }

            Console.WriteLine(count);
        }
    }
}