#include <stdio.h>

int main(){
  int day[] = {0, 31, 28, 31, 30, 31, 30, 31 , 31, 30, 31, 30, 31};
  int count = 0;

  int m,d;
  for(m = 1; m <= 12; m++){
    for(d = 1; d <= day[m]; d++ ){
      if(m == (d%10 + (d/10)%10) )
        count++;
    }
  }
  printf("%d\n",count);
  return 0;
}