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

namespace ForYukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int cnt = 0;

            //1
            for (int i = 1; i <= 31; i++)
            {
                if (isHappy(1, i) == true) cnt++;
            }

            //2
            for (int i = 1; i <= 29; i++)
            {
                if (isHappy(2, i) == true) cnt++;
            }

            //3
            for (int i = 1; i <= 31; i++)
            {
                if (isHappy(3, i) == true) cnt++;
            }

            //4
            for (int i = 1; i <= 30; i++)
            {
                if (isHappy(4, i) == true) cnt++;
            }

            //5
            for (int i = 1; i <= 31; i++)
            {
                if (isHappy(5, i) == true) cnt++;
            }

            //6
            for (int i = 1; i <= 30; i++)
            {
                if (isHappy(6, i) == true) cnt++;
            }

            //7
            for (int i = 1; i <= 31; i++)
            {
                if (isHappy(7, i) == true) cnt++;
            }

            //8
            for (int i = 1; i <= 31; i++)
            {
                if (isHappy(8, i) == true) cnt++;
            }

            //9
            for (int i = 1; i <= 30; i++)
            {
                if (isHappy(9, i) == true) cnt++;
            }

            //10
            for (int i = 1; i <= 31; i++)
            {
                if (isHappy(10, i) == true) cnt++;
            }

            //11
            for (int i = 1; i <= 30; i++)
            {
                if (isHappy(11, i) == true) cnt++;
            }

            //12
            for (int i = 1; i <= 31; i++)
            {
                if (isHappy(12, i) == true) cnt++;
            }

            Console.WriteLine(cnt);
            Console.ReadLine();
        }

        static bool isHappy(int month, int day)
        {
            string strDay = day.ToString();
            string strDay2;
            string strDay3;
            int a;

            if (strDay.Length == 2)
            {
                strDay2 = strDay.Substring(0, 1);
                strDay3 = strDay.Substring(1, 1);
                a = int.Parse(strDay2) + int.Parse(strDay3);
            }
            else
            {
                a = int.Parse(strDay.Substring(0, 1));
            }

            return (month == a) ? true : false;
        }
    }
}