#include<stdio.h>



int daysBy(int month) {
    if(month==1||month==3||month==5||month==7||month==8||month==10||month==12){
        return 31;
    }
    if(month==2){
        return 28;
    }
    return 30;
}

int main(){
    int count;
    count=0;
    for(int month=1;month<=12;month++){
        for(int day=1;day<=daysBy(month);day++){
            int a;
            a=(day/10)+(day%10);
            if(month==a){
                count++;
            }
        }
    }
    printf("%d",count);
}