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

#define MOD 1000000007
#define ll long long int
#define lu long int

int main()
{
  int n;
  int arr[40];
  cin>>n;
  for(int i=0; i<n; ++i){
    cin>>arr[i];
  }
  sort(arr, arr+n);
  ll ans=0, two=1;
  for(int i=n-1; i>=0; --i){
    ans += two*arr[i];
    two *= 2;
  }
  cout<<ans<<endl;
  return 0;
}