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

namespace kkk
{
    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++)
                {
                    //10
                    int a = day / 10;
                    //1 
                    int b = day % 10;
                    //合計
                    int c = a + b;
                    if (c == month)
                    {
                        count++;
                    }

                }
            }
             Console.WriteLine(count);

        }
    }
}