#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define rep(i, n) for(int i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}

int main(){
    int n;
    cin >> n;
    vector<ll> a(n);
    rep(i,n) cin >> a[i];
    ll ans;
    if(n==1) ans = a[0];
    else if(n==2) ans = a[0]*a[1];
    else if(n%2) ans = 1;
    else{
        sort(all(a));
        if(a[0]*a[1]>=a[2]) ans = a[2];
        else ans = a[0]*a[1];
    }
    cout << ans << endl;
    return 0;
}