#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; 
}