using System;
class Program
{
    static void Main(string[] args)
    {
        DateTime dt = new DateTime(2015, 1, 1);
        int cnt = 0;
        while (dt.Year == 2015)
        {
            if (dt.Month == (dt.Day / 10 + dt.Day % 10))
            {
                cnt++;
            }
            dt.AddDays(1.0);
        }
        Console.WriteLine(cnt);
    }
}