#include <iostream>
using namespace std;

int main() {
	int days[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
	int cnt = 0;
	for(int i=1; i<=12; i++) {
		int m = (i%10) + (i/10);
		for(int j=1; j<=days[i-1]; j++) {
			int d = (j%10) + (j/10);
			cnt += m == d;
		}
	}
	cout << cnt << endl;
}