#include #include #include #include using namespace std;

long long a, b; bool c = 0;

int main() { cin >> a >> b; long long cf = a; for (int i = 2; i <= b; i++) { if (a == 1) { cout << "1"; c = 1; break; } cf *= a; if (cf > 1e9) { cout << "-1"; c = 1; break; } } if (c == 0) { cout << cf; } return 0; }