include <bits/stdc++.h>

using namespace std;

int main() {

int n, x, z = 0;
cin >> n;
for (x = 1; x <= n; x++) {
	if (n % x == 0) {
		z++;
	}
}
if (z == 3) {
	cout << "1";
} else {
	cout << "-1";
}
return 0;

}