#include <stdio.h>

int main() {
    int month, day, sum, count;
    int m_day[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    count = 0;
    for (month = 1; month <= 12; month++) {
        for (day = 1; day <= m_day[month]; day++) {
            sum = day / 10 + day % 10;
            if (month == sum)
                count++;
        }
    }
    printf("%d\n", count);

    return 0;
}