#include <bits/stdc++.h>
using namespace std;
int a,b,c=1;
int main(){
    cin >> a >> b;
    for (long long i=1; i<=b; i++){
    	c*=a;
    	if (c>1e9||c<=0){
    		cout << -1;
    		return 0;
		}
	}
    cout << c;
	return 0; 
}
//彭子洋 原创  ^-^  // 

#include <bits/stdc++.h>
#define LL long long

using namespace std;
int a , b , c = 1;
const int N = 1e9;
const int INF = 0x3f3f3f3f;
int main()
{
	    cin >> a >> b;
	    for (LL i = 1; i <= b; i++)
	    {
	    	c *= a;
	    	if (c > N || c <= 0)
	    	{
	    		cout << -1;
	    		return 0;
			}

		}
        cout << c;
		return 0; 
}