class Program
    {
        static void Main(string[] args)
        {
            int[] dayList = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
            int count = 0;
            for (int i = 1; i <= 12; i++)
            {
                for (int j = 1; j <= dayList[i - 1]; j++)
                {
                    if (i == j / 10 + j % 10)
                    {
                        count++;
                    }
                }
            }
            Console.WriteLine(count);
        }
    }