#include <bits/stdc++.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];
    }
    // your code goes here
    sort(calories.begin(),calories.end());
    long int sum=0,i=0;
    for(int j=n-1;j>=0;j--)
    {
        sum+=calories[j]*pow(2,i);
        i++;
    }    
    cout<<sum;
    return 0;
}