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

namespace ConsoleApplication2
{
    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 month = 1; month <= 12; month++)
            {
                for (int day = 1; day <= values[month]; day++)
                {                                
                    int g = day / 10;
                    int h = day % 10;
                    int w = g + h;
                    if (w == month)
                    {
                        count++;
                    }
                }
                
            }
            Console.WriteLine(count);
        }
    }
}