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

int main() {
	int n;
	cin >> n;
	vector<int> a(n);
	for(auto &v : a) cin >> v;
	sort(a.begin(), a.end());
	if(n == 1) {
		cout << a[0] << endl;
	} else if(n == 2) {
		cout << (long long)a[0] * a[1] << endl;
	} else if(n % 2) {
		cout << 1 << endl;
	} else
		cout << min((long long)a[0] * a[1], (long long)a[2]) << endl;
}