package LanQiaoOJ;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class 寻找三个数的最大乘积3 {
	static int N=1010;
	static int []a=new int [N];
	
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		ArrayList<Integer>list=new ArrayList<>();
		for(int i=0;i<n;i++) {
			int x=sc.nextInt();
			list.add(x);
		}
		Collections.sort(list);
		int ans=list.get(n-1)*list.get(n-2)*list.get(n-3);
		ans=Math.max(ans, list.get(0)*list.get(1)*list.get(n-1));
		System.out.print(ans);
	}

}