#include <iostream>
#include <vector>
//#include <iomanip>

using namespace std;

int main()
{
	const int monthCnt = 12;
	const vector<int> monthDays =
	{
		31, 28, 31, 30, 31, 30,
		31, 31, 30, 31, 30, 31,
	};

	int cnt = 0;
	for (int month = 1; month <= monthCnt; month++)
	{
		for (int day = 1; day <= monthDays.at(month - 1); day++)
		{
			if (month == (day / 10) + (day % 10))
				cnt++;
		}
	}

	cout << cnt << endl;

	return 0;
}