#include <iostream>
using namespace std;

int main() {
	int quantity, instrument, counter = 1;
	cin >> quantity >> instrument;
	if ((quantity == 6 && instrument != 1) || (quantity == instrument && quantity % 2 == 0)) {
		cout << 0;
	} else if (quantity == instrument) {
		for (int num = 1; num % quantity != 0; num += 6) {
			if (num != 1 && num % quantity == 1) {
				cout << 0;
				return 0;
			} else {
				counter++;
			}	
		}
		cout << counter;
	} else {
		for (int num = 1; num % quantity != instrument; num += 6) {
			if (num != 1 && num % quantity == 1) {
				cout << 0;
				return 0;
			} else {
				counter++;
			}	
		}
		cout << counter;
	}
	return 0;
}