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();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var a = NList;
        Array.Sort(a);
        var lla = 0L;
        var llb = 0L;
        for (var i = n - 1; i >= 0; --i)
        {
            if ((n - i) % 2 == 1) lla += a[i];
            else llb += a[i];
        }
        var lsa = 0L;
        var lsb = 0L;
        for (var i = n / 2; i < n; ++i) lsa += a[i];
        for (var i = 0; i < n / 2; ++i) lsb += a[i];
        var sla = 0L;
        var slb = 0L;
        for (var i = 0; i < n - n / 2; ++i) sla += a[i];
        for (var i = n - n / 2; i < n; ++i) slb += a[i];
        var ssa = 0L;
        var ssb = 0L;
        for (var i = 0; i < n; ++i)
        {
            if (i % 2 == 0) ssa += a[i];
            else ssb += a[i];
        }
        WriteLine(Math.Max(Math.Min(Math.Abs(lla) - Math.Abs(llb), Math.Abs(lsa) - Math.Abs(lsb)), Math.Min(Math.Abs(sla) - Math.Abs(slb), Math.Abs(ssa) - Math.Abs(ssb))));
    }
}