using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    public void Solve()
    {
        DateTime chkDate = new DateTime(2015, 1, 1);
        int happyDayCnt = 0;
        int dayNum1 = 0, dayNum2 = 0;

        while (chkDate != new DateTime(2015, 12, 31))
        {
            dayNum1 = chkDate.Day.ToString("00").ToArray()[0] - 48;
            dayNum2 = chkDate.Day.ToString("00").ToArray()[1] - 48;

            if (chkDate.Month == dayNum1 + dayNum2) { happyDayCnt++; };

            chkDate = chkDate.AddDays(1);
        }
        Console.WriteLine(happyDayCnt);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}