백준 1037

백준 1037

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

int main()
{
	int n;
	std::cin >> n;
	vector<int> result;
	for (int i = 0; i < n; i++)
	{
		int tmp;
		std::cin >> tmp;
		result.push_back(tmp);
	}
	sort(result.begin(), result.end());
	if (n % 2 == 0)
		cout << result[n / 2-1] * result[n / 2];
	else
		cout << result[n / 2] * result[n / 2];

}