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

namespace lecture
{
    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 cnt = 0;
            for(int i = 1; i <= 12; i++)
            {
                for (int j = 1; j <= values[i]; j++)
                {
                    if(i == (j % 10)+(j / 10)){
                        cnt++;
                    }
                }
            }
            Console.WriteLine(cnt);

        }
    }
}