#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
  int n;
  cin >> n;
  vector<int> c(n);
  for (int i = 0; i < n; i++)
    cin >> c[i];
  sort(c.begin(), c.end());
  long long  m = 1, t = 0;
  for (int i = 0; i < n; i++) {
    t += c[n-1-i]*m;
    m *= 2;
  }
  cout << t << endl;
    return 0;
}