using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        int itemCount = int.Parse(Reader.ReadLine());
        this.Items = Reader.ReadLine().Split(' ').Select(a => int.Parse(a)).ToArray();
        this.GetAns(1, this.Items[0]);
        Console.WriteLine(this.dic[itemCount - 1][true]);


    }

    private void GetAns(int idx, long subTotal)
    {
        if (idx >= this.Items.Length)
        {
            if (dic.ContainsKey(idx))
            {
                dic[idx][true] = Math.Max(dic[idx][true], subTotal);
                dic[idx][false] = Math.Min(dic[idx][false], subTotal);
            }
            else
            {
                dic.Add(idx, new Dictionary<bool, long>());
                dic[idx][true] = subTotal;
                dic[idx][false] = subTotal;
            }
            return;
        }
        long min = long.MaxValue;
        long max = long.MinValue;

        int num = Items[idx];

        min = Math.Min(min, subTotal + num);
        min = Math.Min(min, subTotal - num);
        min = Math.Min(min, subTotal * num);

        max = Math.Max(max, subTotal + num);
        max = Math.Max(max, subTotal - num);
        max = Math.Max(max, subTotal * num);

        if (num != 0)
        {
            min = Math.Min(min, subTotal / num);
            max = Math.Max(max, subTotal / num);
        }
        if (!dic.ContainsKey(idx))
        {
            dic.Add(idx, new Dictionary<bool, long>());
        }
        if((!dic[idx].ContainsKey(true)) || (dic[idx][true] < max)) {
            dic[idx][true] = max;
            this.GetAns(idx + 1, max);
        }
        if ((!dic[idx].ContainsKey(false)) || dic[idx][false] > min)
        {
            dic[idx][false] = min;
            GetAns(idx + 1, min);
        }
    }

    private int[] Items;

    private Dictionary<int, Dictionary<bool, long>> dic = new Dictionary<int, Dictionary<bool, long>>();


    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"


16
6 9 1 2 1 2 1 2 1 4 1 4 1 8 1 2



";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}