#include <iostream>

using namespace std;

int main(int argc, const char* argv[])
{
	int ds[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	int cnt  = 0;
	int m	= 0;
	for (auto&& d : ds) {
		for (int i = 1; i <= d; i++) {
			cnt += (m == (i / 10 + i % 10));
		}
		m++;
	}
	cout << cnt << endl;
	return 0;
}