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

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
                                // 0   1   2   3   4   5   6   7   8   9  10  11  12
            int[] pm = new int[] { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
            int n = 0;
            for (int i = 1; i <= 12; i++)
            {
                for (int j = 1; j <= pm[i]; j++)
                {
                    if (i == (j / 10 + j % 10))
                    {
                        //Console.WriteLine(i + " " + j);
                        n++;
                    }
                }
            }
            Console.WriteLine(n);
            Console.ReadLine();
        }
    }
}