import java.time.LocalDate;

public class No188 {

    public static void main(String[] args) {
        LocalDate start = LocalDate.of(2015, 1, 1);
        LocalDate end = LocalDate.of(2015, 12, 31);

        int count = 0;
        for (LocalDate date = start; date.isBefore(end) || date.isEqual(end); date = date.plusDays(1)) {
            int month = date.getMonth().getValue();
            int day = date.getDayOfMonth();
            int firstDigit = day / 10;
            int secondDigit = day % 10;
            if (month == firstDigit + secondDigit) {
                count++;
            }
        }
        System.out.println(count);
    }
}