using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[] LList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => int.Parse(ReadLine())).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var a = NList;
        var cum = new long[n + 1];
        for (var i = 0; i < n; ++i) cum[i + 1] = cum[i] + a[i];

        var maxleft = new long[n];
        maxleft[0] = long.MinValue;
        var tmp = cum[0];
        for (var i = 1; i < n; ++i)
        {
            maxleft[i] = Math.Max(maxleft[i - 1], cum[i] - tmp);
            tmp = Math.Min(tmp, cum[i]);
        }
        var minleft = new long[n];
        minleft[0] = long.MaxValue;
        tmp = cum[0];
        for (var i = 1; i < n; ++i)
        {
            minleft[i] = Math.Min(minleft[i - 1], cum[i] - tmp);
            tmp = Math.Max(tmp, cum[i]);
        }
        var maxright = new long[n];
        maxright[^1] = long.MinValue;
        tmp = cum[n];
        for (var i = n - 2; i >= 0; --i)
        {
            maxright[i] = Math.Max(maxright[i + 1], tmp - cum[i + 1]);
            tmp = Math.Max(tmp, cum[i + 1]);
        }
        var minright = new long[n];
        minright[^1] = long.MaxValue;
        tmp = cum[n];
        for (var i = n - 2; i >= 0; --i)
        {
            minright[i] = Math.Min(minright[i + 1], tmp - cum[i + 1]);
            tmp = Math.Min(tmp, cum[i + 1]);
        }
        var ans = long.MinValue;
        for (var i = 0; i + 1 < n; ++i)
        {
            ans = Math.Max(ans, maxleft[i + 1] * maxright[i]);
            ans = Math.Max(ans, minleft[i + 1] * minright[i]);
        }
        WriteLine(ans);
    }
}