#include <bits/stdc++.h>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n;
    cin>>n;
    vector<int> vt(n);
  for(int i=0;i<n;i++)
       cin>>vt[i];
    sort(vt.begin(),vt.end());
     vector<int> ::reverse_iterator rit;
     unsigned long long  int lt=1,sum=0;
      for(rit= vt.rbegin();rit!=vt.rend();rit++)
            {
                sum=sum+ (*rit)*lt;
               lt= lt*2;
      }
    cout<<sum<<endl;
    return 0;
}