#include<bits/stdc++.h>
using namespace std ;
#define ll long long
int main()
{
    ll n ;
    cin >> n ;
    vector < ll > v ;
    for(int i = 0 ; i < n ; i++)
    {
        ll a ;
        cin >> a ;
        v.push_back(a) ;
    }
    sort(v.rbegin() , v.rend()) ;
    ll sum = 0 ;
    for(int i = 0 ; i < v.size() ; i++)
    {
        sum += v[i]*pow(2,i) ;
    }
    cout << sum << endl ;
}