include <bits/stdc++.h>

using namespace std;

int main() {

long long a, b;
cin >> a >> b;
long long h = 1;
if (a == 1 || b == 1) {
	cout << a;
	return 0;
}
for (int i = 1; i <= b; i++) {
	h = h * a;

	if (h >= 1000000000) {
		cout << -1;
		return 0;
	}
}
cout << h;
return 0;

}