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

int main(){
    int N;
    cin>>N;
    long long A[N];
    for(int i=0;i<N;++i){
        cin>>A[i];
    }
    sort(A,A+N);
    if(N==1){
    	cout<<A[0]<<endl;
    }else if(N==2){
    	cout<<(A[0]*A[1])<<endl;
    }else if(N%2){
        cout<<1<<endl;
    }else{
    	cout<<min(A[2],A[0]*A[1])<<endl;
    }
}