import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int[] arr=new int[n];
        for(int i=0;i<n;i++){
            arr[i]=sc.nextInt();
        }

        int product_suffix=1;
        int product_prefix=1;
        int max_product=Integer.MIN_VALUE;
        for(int i=0;i<n;i++){
            if(product_suffix==0) product_suffix=1;
            if(product_prefix==0) product_prefix=1;
            product_suffix*=arr[i];
            product_prefix*=arr[n-i-1];
            max_product=Math.max(max_product,Math.max(product_suffix,product_prefix));
        }
        System.out.println(max_product);
        
    }
}