#include <bits/stdc++.h>
#include <math.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> calories(n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
    int temp;
    for(int i=0;i<n;i++)
        {
        for(int j=0;j<n-1;j++)
            {
            if(calories[j]<calories[j+1])
                {
                temp=calories[j];
                calories[j]=calories[j+1];
                calories[j+1]=temp;
            }
        }
    }
    long ans=0;
    for(int i=0;i<n;i++)
        {
        ans=ans+(calories[i]*pow(2,i));
    }
    cout<<ans;
    // your code goes here
    return 0;
}