#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  ans=0;
    long factor=1;
    for(int i=n-1;i>=0;i--){
        ans+=calories[i]*factor;
        factor<<=1;
    }
    cout<<ans;
    return 0;
}