#include <iostream>
#include <algorithm>
#define int long long
using namespace std;

int n;
int a[100000];

signed main() {
	cin >> n;
	for (int i = 0; i < n; i++) cin >> a[i];
	sort(a, a + n);
	
	if (n == 1) cout << a[0] << endl;
	if (n == 2) cout << a[0] * a[1] << endl;
	if (n >= 3 && n % 2 == 1) cout << 1 << endl;
	if (n >= 4 && n % 2 == 0) cout << min(a[0] * a[1], a[2]) << endl;
	
	return 0;
}