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

        for (int month = 1; month <= 12; month++)
        {
            for (int day = 1; day <= days[month]; day++)
            {
                if (month == (day % 10) + day / 10) happyDay++;
            }
        }

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