using System;

class S21_happydays{
  public static void Main(string[] args){
    int[] days = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    int count = 0;

    for(int m = 1; m <= 12; m++){
      for(int d = 1; d <= days[m]; d++){
          if(m == (d%10 + (d/10)%10 ))
            count++;
      }
    }

    Console.WriteLine("{0}",count);
  }
}