using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Globalization;
using System.Diagnostics;
using static System.Console;
using Pair = System.Collections.Generic.KeyValuePair<int, int>;

class Program
{
    static void Main()
    {
        //SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
        new Program().Solve();
        Out.Flush();
    }
    Scanner cin = new Scanner();
    Random rnd = new Random();
    Stopwatch sw = new Stopwatch();
    readonly int[] dd = { 0, 1, 0, -1, 0 };
    readonly int mod = 1000000007;
    readonly string alfa = "abcdefghijklmnopqrstuvwxyz";

    int N;
    int[] A;
    long ans = long.MinValue;
    void Solve()
    {
        N = cin.Nextint;
        A = cin.Scanint;
     
        Dfs(1, A[0]);

        WriteLine(ans);
        

        /*long ans = A[1] + A[0];
        ans = Math.Max(A[1] * A[0], ans);
        ans = Math.Max(A[0] - A[1], ans);
        if(A[1] != 0) ans = Math.Max(A[0] / A[1], ans);

        for (int i = 2; i < N; i++)
        {
            long d = ans;
            ans = d + A[i];
            ans = Math.Max(d * A[i], ans);
            ans = Math.Max(d - A[i], ans);
            if (A[i] != 0) ans = Math.Max(d / A[i], ans);
        }
        WriteLine(ans);*/
    }

    void Dfs(int now, long sum)
    {
        if(now == N)
        {
            ans = Math.Max(ans, sum);
            return;
        }
        Dfs(now + 1, sum + A[now]);
        Dfs(now + 1, sum * A[now]);
        Dfs(now + 1, sum - A[now]);
        //if (A[now] != 0) Dfs(now + 1, sum / A[now]);
    }

}

class Scanner
{
    string[] s; int i;
    char[] cs = new char[] { ' ' };
    public Scanner() { s = new string[0]; i = 0; }
    public string[] Scan { get { return ReadLine().Split(); } }
    public int[] Scanint { get { return Array.ConvertAll(Scan, int.Parse); } }
    public long[] Scanlong { get { return Array.ConvertAll(Scan, long.Parse); } }
    public double[] Scandouble { get { return Array.ConvertAll(Scan, double.Parse); } }
    public string Next
    {
        get
        {
            if (i < s.Length) return s[i++];
            string st = ReadLine();
            while (st == "") st = ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            i = 0;
            return Next;
        }
    }
    public int Nextint { get { return int.Parse(Next); } }
    public long Nextlong { get { return long.Parse(Next); } }
    public double Nextdouble { get { return double.Parse(Next); } }
}