#include <iostream>
using namespace std;

int main(int argc, char**argv)
{
	int days[] = {31,28,31,30,31,30,31,31,30,31,30,31};
	int happy = 0;
	int max = sizeof(days) / sizeof(days[0]);

	for (int ii=0; ii<max; ++ii) {
		int m = (ii+1);
		for (int day=1; day<=days[ii]; ++day) {
			int du = day / 10;
			int dd = day % 10;
			happy = (m == (du+dd)) ? happy+1 : happy;
		}
	}
	cout << happy << endl;

	return 0;
}