#include <bits/stdc++.h> using namespace std; long long a,b,ans=1,cnt; int main(){ freopen("pow.in","r",stdin); freopen("pow.out","w",stdout); cin>>a>>b; for(int i=1;i<=b;i++){ ans*=a; if(ans>1000000000){ cout<<-1; return 0; } } cout<<ans; return 0; }