#include <stdio.h>
int happydayjudge(int d);

int main(void){
    int month, day, ans = 0;
    for(month = 1; month <= 12; month++){
        if(month == 2){
            for(day = 1; day <= 28; day++){
                if(happydayjudge(day) == month){
                    ans++;
                }
            }
        }
        else if(month == 4 || month == 6 || month == 9 || month == 11){
            for(day = 1; day <= 30; day++){
                if(happydayjudge(day) == month){
                    ans++;
                }
            }
        }
        else{
            for(day = 1; day <= 31; day++){
                if(happydayjudge(day) == month){
                    ans++;
                }
            }
        }
    }
    printf("%d\n", ans);
    return 0;
}

int happydayjudge(int d){
    int t;
    t = (d / 10) + (d % 10);
    return t;
}