C++ :

#include<bits/stdc++.h>
using namespace std;

long long result = 1;
int main(){
    //freopen("pow.in","r",stdin);
    //freopen("pow.out","w",stdout);
    int a,b;
    cin>>a>>b;
    if(a == 1){
        //如果a=1,b=10^9,会超时
        cout<<1;
        return 0;
    }
    for(int i=1;i<=b;i++){
        result *= a;
        if(result > pow(10,9)){
            cout<<-1;
            return 0;
        }
    }
    cout<<result;
    return 0;
}