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;
}