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


int main() {
    int N;
    long sum = 0;
    cin >> N;
    int arr[N];
    for(int i = 0; i < N ; i++){
        cin >> arr[i];
    }
    sort(arr, arr + N);
    for(int i = N - 1, j = 0; i >= 0 ; i--, j++){
        sum += arr[i] * pow(2,j);
     }
    cout << sum;
    return 0;
}