#include<stdio.h>

int happydays=0;

int happyday(int month, int day){
    int a, b, c;
    a = day/10;
    b = day-a*10;
    c = a + b;
    if(month==c){
        happydays+=1;
    }
}

int main(void){
    int month, day;
    for(month=1;month<=12;month++){
        if(month==1||month==3||month==5||month==7||month==8||month==10||month==12){
            for(day=1;day<=31;day++){
                happyday(month, day);
            }
        }else if(month==2){
            for(day=1;day<=28;day++){
                happyday(month, day);
            }
        }else{
            for(day=1;day<=30;day++){
                happyday(month, day);
            }
        }
    }
    printf("%d",happydays);
}