#include <bits/stdc++.h> 
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
const ull M = 1e9; 
ll n,m;
ull u = 1;
int main(){
	freopen("csp2022pj_pow.in","r",stdin);
	freopen("csp2022pj_pow.out","w",stdout);
    cin>>n>>m;
    if(n == 1){
    	cout<<1<<endl;
    	return 0;
	}
    if(m == 0){
    	cout<<1<<endl;
    	return 0;
	}
    for(ll i = 1;i <= m;i++){
    	u = u * (ull)n;
    	if(u > M){
    		cout<<-1<<endl;
    		return 0;
		}
	}
	cout<<u<<endl;
	
	return 0;
}