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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>
#define LP pair<ll, ll>
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define all(s) s.begin(), s.end()
#define rall(s) s.rbegin(), s.rend()
template<class T>
void chmax(T& a, T b) { a = max(a, b); };
template<class T>
void chmin(T& a, T b) { a = min(a, b); };

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


  return 0;
}