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#include <bits/stdc++.h>
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using namespace std;
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typedef long long LL;
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int main() {
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freopen("pow.in", "r", stdin);
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freopen("pow.out", "w", stdout);
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LL a, b, res = 1;
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cin >> a >> b;
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//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！
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if (a == 1) {
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printf("%d\n", 1);
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exit(0);
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}
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for (LL i = 1; i <= b; i++) {
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res *= a;
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if (res > 1e9) {
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printf("%d\n", -1);
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exit(0);
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}
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}
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printf("%lld\n", res);
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return 0;
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}
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