#include<bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
ull maxn=pow(2,31)-1;
ull n,m;
ull ksm(ull a,ull b)
{
	ull ans=1;
	while(b)
	{
		if(b&1) ans=ans*a;
		b>>=1;
		a=a*a;
	}
	return ans;
}
int main()
{
	//freopen("pow.in","r",stdin);
	//freopen("pow.out","w",stdout);
	cin>>n>>m;
    if(n==1)
    {
        cout<<1<<endl;
        return 0;
    }
	if(ksm(n,m)>maxn) cout<<-1<<endl;
	else cout<<ksm(n,m);
	return 0;
}

RT 评测