#include <stdio.h>

main() {
    int count = 0;

    int numofdays[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    
    for (int month=1; month<=12; month++) {
        for (int day = 1; day <= numofdays[month-1]; day++) {
            if (month == (day/10) + (day%10))
                count++;
        }
    }
    
    printf("%d\n", count);
}