#include<bits/stdc++.h>
using namespace std;
long long a,b,ans,g;
int main(){
	freopen("pow.in","r",stdin);
	freopen("pow.out","w",stdout);
	cin>>a>>b;
	ans=a;
	while(b>1){
//		cout<<ans<<" "<<b<<endl;
		g=0;
		for(int i=2;i*i<=b;i++){
			if(b%i==0){
				for(int j=1;j<i;j++){
					ans*=a;
					if(ans>1000000000){
						cout<<"-1";
						return 0;
					}
				}
				a=ans;
				b=b/i;
				g=1;
//				cout<<b<<" "<<b/i<<endl;
				break;
			}
		}
		if(!g)break;
	}
	a=ans;
	for(int i=1;i<b;i++){
		ans*=a;
		if(ans>1000000000){
			cout<<"-1";//<<ans<<" "<<a;
			return 0;
		}
	}
	cout<<ans;
	return 0;
}