#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];
    }
    sort (calories.begin(),calories.end());
    long long int miles = 0;
    long long int temp = 1;
    for(int calories_i = n-1; calories_i >= 0; calories_i--){
        miles += calories[calories_i]*temp;
        temp *= 2;
    }
    cout << miles << endl;
    return 0;
}