#include <bits/stdc++.h>

using namespace std;
typedef long long LL;
int main() {
    
    freopen("pow.in", "r", stdin);
    freopen("pow.out", "w", stdout);

    LL a, b, res = 1;
    cin >> a >> b;
    //需要对a==1进行特判，否则肯定会TLE一个点,为啥呢？因为b的范围！它是<=1e9!如果a是1，会空跑1e9次！
    if (a == 1) {
        printf("%d\n", 1);
        exit(0);
    }
    for (LL i = 1; i <= b; i++) {
        res *= a;
        if (res > 1e9) {
            printf("%d\n", -1);
            exit(0);
        }
    }
    printf("%lld\n", res);
    return 0;
}