#include <iostream>
using namespace std;
int main() {
	int calendar[13] = { 12,31,28,31,30,31,30,31,31,30,31,30,31 };
	int happyday = 0;
	for (int i = 1; i <= calendar[0]; i++) {
		for (int j = 1; j <= calendar[i]; j++) {
			if (j / 10 + j % 10 == i) {
				happyday++;
			}
		}
	}
	cout << happyday << endl;
}