#include<bits/stdc++.h>
 
using namespace std;
 
int t;
int a,b,c;
 
int main() {
	freopen("csp2022pj_pow.in","r",stdin);
	freopen("csp2022pj_pow.out","w",stdout);
		cin>>a>>b;
		c=(pow(a,b));
		if(c<0) {
			cout<<-1;
		} else {
			cout<<c;
		}
		cout<<endl;
 
	return 0;

}



//很简单的一道题，用pow函数就行了