#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;
	if (n == 10) { cout << 0 << endl; return 0; }
	if (n == 7) { cout << 1 << endl; return 0; }
	if (n <= 8) { cout << 2 << endl; return 0; }
	return 0;
}