#include<bits/stdc++.h>
using namespace std;
int main(){
	long long w;
	int n,h;
	cin>>n>>h;
	w=pow(n,h);
	if(w<0) cout<<"-1";
	else cout<<w; 
	return 0;
}

/**************************************************************
	Problem: 2405
	User: houshanglin
	Language: C++
	Result: Wrong Answer
****************************************************************/