题解，简洁

#include<bits/stdc++.h>
using namespace std;
int main() {
int a, b;
cin >> a >> b;
long long result = 1;
for (int i = 0; i < b; ++i) {
result *= a;
if (result > 1e9) {
result = -1;
break;
}
}
cout << result << endl;
return 0;
}