using System;
using System.Linq;

namespace No188
{
    class Program
    {
        static void Main(string[] args)
        {
            var result = Enumerable.Range(0, int.MaxValue)
                .Select(i => new DateTime(2015, 1, 1).AddDays(i))
                .TakeWhile(date => date.Year == 2015)
                .Count(date => date.Month == date.Day * 0.1 + date.Day - date.Day * 0.1);

            Console.Write(result);
        }
    }
}