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

namespace pj1
{
    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;
            int num1,num2;
            for (int i = 1; i <= 12; i++)
            {
                for (int j = 1; j <= values[i];j++ )
                {
                    num1 = j / 10;
                    num2 = j - (num1 * 10);
                    if (i == num1 + num2)
                    {
                        count++;
                    }
                }
            }
            Console.WriteLine(count);
        }
    }
}