#include <stdio.h>

int main(void){
  const int monthLength[] = {31,28,31,30,31,30,31,31,30,31,30,31};
  int count = 0;
  for(int i = 0; i < 12; i++){
    for(int j = 0; j < monthLength[i]; j++){
      if(j % 10 + j / 10 == i + 1)count++;
    }
  }
  printf("%d\n",count);
  return 0;
}