#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(auto &p: a) cin >> p;
    sort(a.begin(), a.end(), greater<int>());

    int ans = 0;
    int floor = 0;
    int shopsum = 1;
    int power2 = 1;
    for(int i = 0; i < n; i++){
        if(i == shopsum){
            floor++;
            power2 *= 2;
            shopsum += power2;
        }
        ans += a[i]*floor;
    }
    
    cout << ans << endl;
    return 0;
}