#include <iostream>
using namespace std;

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