include

using namespace std;

int main () {

int a, b = 0, i;
cin >> a;

for (i = 2; i <= a - 1; i++) {

	if (a % i == 0) {
		b++;
	}
}

if (b == 0) {
	cout << "1";
} else {
	cout << "-1";
}

return 0;

} 2025-03-23 09:35:06 星期日