rt

#include <bits/stdc++.h>

#define int long long

using namespace std;

const int N = 1e9;

int a,b;

inline int Pow(int a,int b) {
	int res = 1;
	for (int i = 1; i <= b; i ++ ) res *= a;
	return res;
}

signed main() {
	cin >> a >> b;
	if (a == 1) { cout << 1 << endl; return 0; }
	if (b == 1) {
		if (a <= N) cout << a << endl;
		else cout << "-1" << endl;
		return 0;
	}
	if (a >= 31623 || b >= 30) { cout << "-1" << endl; return 0; }
	
	cout << Pow(a,b) << endl;
    return 0;
}