bi li ben!!!

#include<bits/stdc++.h>
using namespace std;

//int main(){
int a,b;
cin >>a>>b;
long long n=1;
for (int i=1;i<=b;i++){
n=n*a;
if (n>1000000000){
cout << "-1" << endl;
return 0;
}
}
cout << n << endl;
return 0;
}