using System;
public class Program
{
    static void Main()
    {
        int[] days = new int[13] {0,
            31, 28, 31, 30, 31, 30,
            31, 31, 30, 31, 30, 31};
        int count = 0;
        for (int m = 1; m <= 12; m++)
        {
            for (int d = 1; d <= days[m]; d++)
            {
                if (m == d / 10 + d % 10)
                {
                    count++;
                }

            }
        }
        Console.WriteLine(count);
    }
}