code

#include<bits/stdc++.h>
using namespace std;
long long int a,b;
int main(){
	scanf("%lld%lld",&a,&b);
    if((long long)pow(a,b)>1000000000||(long long)pow(a,b)<0)printf("-1");
    else printf("%lld",(long long)pow(a,b));
	return 0;
}