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

namespace Lecture3
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] values = new int[] { 0, 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 <= values[i]; j++)
                {
                    int day = j % 10;

                    if (j / 10 != 0)
                    {
                        day += j / 10;
                    }

                    if (day == i)
                    {
                        count++;
                    }
                }
            }

            Console.WriteLine(count);
        }
    }
}