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 count = 0;
            for (int month = 1; month <= 12; month++)
            {
                for(int day = 1; day <= values[month] ; day++)
                {
                    // 10の位の数
                    int a = day / 10;
                    // 1の位の数
                    int b = day % 10;
                    // 合計の数
                    int c = a + b;

                    if (c == month)
                    {
                        count++;
                    }

                }
            }
            Console.WriteLine(count);

        }
    }
}