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

namespace jyugyou
{
    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 i = 1; i <= 12; i++)
            {
          
                for (int x = 1; x <= values[i] ; x++)
                {
                    int a = x / 10;
                    int b = x % 10;
                    int c = a + b;
                   if(c == i )
                   {
                       count++;
                     
                   }
                  
                }
               
             
            }

            Console.WriteLine(count);
        }
    }
}