#include <bits/stdc++.h>

using namespace std;
typedef long long LL;

int main() {
    freopen("pow.in", "r", stdin);
    freopen("pow.out", "w", stdout);

    int a, b;
    cin >> a >> b;

    LL res = 1;
    if (a == 1) {
        printf("1");
        exit(0);
    }

    for (int i = 1; i <= b; i++) {
        res *= a;
        if (res > 1e9) {
            puts("-1");
            exit(0);
        }
    }
    printf("%lld\n", res);
    return 0;
}