using System;

class Program
{
    static void Main(string[] args)
    {
        int i = 0;
        
        for (DateTime dt = new DateTime(2015, 1, 1); dt.Year == 2015; dt = dt.AddDays(1))
        {
            if (dt.Day / 10 + dt.Day % 10 == dt.Month)
            {
                i++;
            }
        }

        Console.WriteLine(i);
        Console.ReadLine();
    }
}