#include <string>
#include <iostream>
#include <vector>

using namespace std;

int main() {

	vector<int> Day = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	int happyDay = 0;

	for (int i = 1; i <= 12; i++)
	{
		for (int j = 1; j <= Day[i]; j++)
		{
			if (i == j /10 % 10 + j % 10)
			{
				happyDay++;
			}
		}
	}
	
	cout << happyDay << endl;
	
	return 0;
}