#include <iostream>

int main(){
 unsigned char EndAt30[] = {4,6,9,11};
 unsigned char PassedSubscript = 0;
 unsigned char DayOfMonthEnd = 0;
 unsigned char result = 0;
 for (unsigned char month = 1;month<=12;month++){
  bool judge = (EndAt30[PassedSubscript] == month);
   if (judge) PassedSubscript++;
   DayOfMonthEnd = (judge) ? 30 : 31;
  for (unsigned char date = 1; date<=DayOfMonthEnd;date++){
    if (month == date/10 + date%10)result++;
  }
 }
 printf("%d",result);
}