#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int main() {
	int N;
	cin >> N;
	vector<int> A(N);
	for (int i = 0; i < N; i++) {
		cin >> A[i];
	}
	if (N % 2 == 1) {
		cout << (N == 1 ? A[0] : 1) << endl;
	}
	else {
		sort(A.begin(), A.end());
		cout << (N == 2 ? 1LL * A[0] * A[1] : 1LL * A[N - 2]) << endl;
	}
	return 0;
}