Untitled

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

int main(){ 
	long long int n, arr[100000]; 
	cin >> n; 
	for(int i = 0; i < n; i++){  
		cin >> arr[i];
	}  	
	sort(arr, arr+n); 
	int max1 = arr[n-1] * arr[n-2]; 
	int max2 = arr[0] * arr[1];
	cout << max(max1, max2);
}