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

namespace lecture2
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] values = new int[] {0,31,28,31,30,31,30,31,30,31,31,30,31,};
            
            int count = 0;
            for (int i = 1; i <= 12; i++)
            {
               for(int x = 1;x <=values[i];i++){
               
               int a = x / 10;
                int b = x % 10;
                int c = a + b;
                if (c == i){
               count++;
               
               
               }
           
                    
                }
            }
          Console.WriteLine(count);
        }
     


          
        }
    }