//Code 1
 #include<iostream>
#include<cmath>
using namespace std;
int main()
{
    long long a;
    long long b;
    long long c;
    long long d=0;
    cin>>a>>d;
    if(d!=0) b=d;
    else b=1;
    c=pow(a,b);
    if(c<=1000000000) cout<<c;
    else if(c<0) cout<<"-1";
    else cout<<"-1";
}

//Code 2
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
  long long a,b;
  double m;
  cin>>a>>b;
  m=pow(a,b);
  long long e=m;
  if(e<=1000000000) cout<<e;
  else cout<<-1;
}

//Code 3（60pts）
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
  double a,b,c;
  cin>>a>>b;
  c=pow(a,b);
  if(c<=1000000000) cout<<c;
  else cout<<"-1";
} 

//Code 4
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
  long long a,b,c;
  cin>>a>>b;
  c=pow(a,b);
  if(c<=1000000000) cout<<c;
  else cout<<-1;
}