using System.Linq;
using System;

public class Hello
{
    public static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, long.Parse);
        var res = a[0];
        for (int i = 1; i < n; i++)
        {
            var t = new long[4];
            t[0] = res + a[i];
            t[1] = res * a[i];
            t[2] = res - a[i];
            if (a[i] != 0) t[3] = res / a[i];
            else a[i] = int.MinValue;
            res = t.Max();
        }
        Console.WriteLine(res);
    }
}