include <bits/stdc++.h>

using namespace std;

int main() {

int m;
cin >> m;
int flag = 0;
for (int i = 1; i <= m; i++) {
	if (m % i == 0) {
		flag += 1;
	}
}
if (flag == 3) {
	cout << 1;
} else {
	cout << -1;
}
return 0;

}