#include<stdio.h>

int main(void){

int day_array[12]={31,28,31,30,31,30,31,31,30,31,30,31};
int month,day;
int happy_day=0;
int day_total=0;

for(month=1;month<=12;month++){
for(day=1;day<=day_array[month-1];day++){
day_total=0;

day_total = day/10;
day_total += day%10;

if(month==day_total){
happy_day++;
}

}
}

printf("%d",happy_day);

return 0;

}