#include<bits/stdc++.h>
#define int long long
using namespace std;
int a,b,c;
signed main(){
	cin>>a>>b;
	c = a;
	for(int i = 2;i<=b;i++){
		a = a * c;
		if(a>1e9){
			cout<<-1;
			return 0;
		}
	}
	cout<<a;
	return 0;
}

#include<iostream>
#include<cstdio>
#include<cmath>
#include<algorithm>
using namespace std;
long long a,b;
long long c;
int main(){
	//freopen("pow.in","r",stdin);
	//freopen("pow.out","w",stdout);
	scanf("%lld %lld",&a,&b);
	c = 1;
	for(int i=1;i<=b;i++){
		c*=a;
		if(c>1e9){
			printf("%s","-1");
			return 0;
		}		
	} 
	printf("%lld",c);
	//fclose(stdin);
	//fclose(stdout);
	return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int max = pow(10,9);
    long long sum = 1;
    long long a,b;
    cin>>a>>b;
    for (int i = 1;i <= b;i++)
    {
        sum *= a;
        if (sum > max)
        {
            cout<<-1;
            return 0;
        }
    }
    if (sum == 0)
    {
        cout<<-1;
        return 0;
    }
    cout<<sum;
    return 0;
}