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

bool greaterThan(int i, int j) {
    return i > j;
}
int main() {
    int n;
    cin >> n;
    int *array = new int[n];
    for(int i = 0; i < n; ++i) {
        cin >> array[i];
    }
    
    sort(array, array+n, greaterThan);
    
    long miles = 0;
    for(int i = 0; i < n; ++i) {
        miles += array[i] * pow(2, i);
    }
    
    cout << miles;
    delete [] array;
}