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[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).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;
        Array.Sort(a, (l, r) => r.CompareTo(l));
        var k = 0;
        var i = 0;
        var ans = 0L;
        while (i < n)
        {
            for (var j = 0; j < 1 << k; ++j)
            {
                ans += k * a[i + j];
            }
            i += 1 << k;
            ++k;
        }
        WriteLine(ans);
    }
}