using System;

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        Array.Sort(a);
        Array.Reverse(a);
        getAns(n, a);
    }
    static void getAns (int n, int [] a)
    {
        var s = 0;
        var t = 1;
        var p = 0;
        var ans = 0L;
        while (true)
        {
            for (int i = 0; i < t; i++)
            {
                ans += s * a[p++];
                if (p == n) { Console.WriteLine(ans); return; }
            }
            t *= 2;
            s++;
        }
    }
}