#include <stdio.h>
#include <math.h>

int Dsum(int num);


int main()
{
	int month;
	int day;
	int ans = 0;

	for (month = 1; month <=12; month++) {
		for (day = 1; day <= 28; day++) {
			if (month == Dsum(day)) {
				ans++;
			}
		}
	}
	ans += 2;
	printf("%d", ans);
	return 0;
}

int Dsum(int num)
{
	double ans;

	ans = floor(num / 10) + num % 10;
	return (int)ans;
}