#include <bits/stdc++.h>
using namespace std;

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