using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var happyDay = 0;
        var days = new int[] { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

        foreach (var month in Enumerable.Range(1, 12))
        {
            foreach (var day in Enumerable.Range(1, days[month]))
            {
                if (month == (day % 10) + day / 10) happyDay++;
            }
        }

        Console.WriteLine(happyDay.ToString());
    }
}