/*
  Esteban Arango Medina
*/
#include <algorithm>
#include <iostream>
#include <iterator>
#include <numeric>
#include <sstream>
#include <fstream>
#include <cassert>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <string>
#include <cstdio>
#include <vector>
#include <bitset>
#include <cmath>
#include <queue>
#include <tuple>
#include <deque>
#include <stack>
#include <list>
#include <map>
#include <set>
using namespace std;
typedef long long ll;
typedef pair<int,int> ii;
typedef pair<string,int> si;
typedef pair<int,ii> iii;
typedef vector <int> vi;
typedef vector <char> vc;
typedef vector <si> vsi;
typedef vector <ii> vii;
typedef vector <vi> vivi;
typedef vector <string> vs;
typedef map <string,vs> msvs;
typedef map <string,int> msi;
typedef map <string,string> mss;
#define INF 1000000000

int main(){
  // freopen("in.in", "r", stdin);
  // freopen("out.out", "w", stdout);

  int n; cin >> n;
  vi calories(n);
  for(int calories_i = 0; calories_i < n; calories_i++){
     cin >> calories[calories_i];
  }
  sort(calories.begin(),calories.end());
  ll ans = 0;
  for(int i = n-1, j=0; i > -1; i--,j++){
    ans += calories[i] * pow (2, j);
  }
  cout<<ans<<endl;
  return 0;
}