/* -*- coding: utf-8 -*-
 *
 * 1416.cc:  No.1416 ショッピングモール - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 50000;

/* typedef */

typedef long long ll;

/* global variables */

int as[MAX_N];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);

  for (int i = 0; i < n; i++) scanf("%d", as + i);
  sort(as, as + n, greater<int>());

  ll sum = 0;
  int f = 0, bf = 1, c = 0;
  for (int i = 0; i < n; i++) {
    sum += as[i] * f;
    if (++c >= bf) f++, bf <<= 1, c = 0;
  }

  printf("%lld\n", sum);
  return 0;
}