tj

#include<iostream>
#include<cmath>
#include<algorithm>
#include<queue>
#include<stack>
#include<vector>
#include<cstdio>
#include<unordered_map>
#define ll long long
using namespace std;
const ll N=1e9;
ll a,b;
int main() {
	cin>>a>>b;
	ll t=1;
	while(b--) {
		if(N/a<t) {
			cout<<-1;
			return 0;
		}
		t*=a;
	}
    cout<<t;
}