include <bits/stdc++.h>

using namespace std;

int main() {

int n;
int ans = 0;
cin >> n;
for (int i = 1; i <= n; i++) {
	if (n % i == 0) {
		ans++;
	}
}
if (ans == 3) {

	cout << 1;
}

else {

	cout << -1;
}

return 0;

}