#include<iostream>
using namespace std;
typedef unsigned long long ll;
ll ksm(ll a,ll b){
	ll ans=1;
	while(b>0){
		if(b%2==1)ans=ans*a;
		a=a*a;
		b/=2;
	}
	return ans;
}
int main(){
	ll a,b,p=1;
	cin>>a>>b;
	if(ksm(a,b)>(ll)1e9)cout<<-1;
    else cout<<ksm(a,b);
	return 0;
}

求助，为啥这个做法A不了（我可能有点发癫