70分

#include<iostream>
#include<cmath>
#define int long long
using namespace std;
signed main() {
	int a, b, n;
	cin >> a >> b;
	n = pow(a, b);
	if (n >= pow(10, 9))
		cout << "-1" << endl;
	else
		cout << n << endl;
	return 0;
}