#include <stdio.h>
int main(void){
    int day_array[]={31,28,31,30,31,30,31,31,30,31,30,31};
    int month,day;
    int day_total=0,happy_days=0;
    
    for(month=1;month<=12;month++){
        for(day=1;day<=day_array[month-1];day++){
            day_total = day/10+day%10;
            if(month==day_total){
                happy_days++;
            }
        }
    }
    printf ("%d\n",happy_days);
    return 0;
}