#include <stdio.h>
#include <algorithm>
#include <deque>
using namespace std;
using ll = long long;

//188
int main() {
	int days[13] = { 0,
		31, 28, 31, 30,
		31, 30, 31, 31,
		30, 31, 30, 31
	};
	int count = 0;
	for (int month = 1; month <= 12; month++)
		for (int day = 1; day <= days[month]; day++)
			if (month == day % 10 + day / 10)
				count++;
	printf("%d\n", count);
}