#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 miles[n];
    miles[0]=calories[n-1]*pow(2,0);
    for (int i=1;i<n;i++){
        miles[i]=miles[i-1]+calories[n-1-i]*pow(2,i);
    }
    long max=miles[0];
    for (int i=1;i<n;i++){
        if (miles[i]>max)
        max=miles[i];
    }
    cout << max;
    // your code goes here
    return 0;
}