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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int N;
    cin >> N;
    int arr[40];
    long long res = 0, pow = 1;
    for (int i = 0 ; i < N; i++) {
        cin >> arr[i];
    }
    sort(arr, arr + N);
    reverse(arr, arr + N);
    for (int i = 0; i < N; i++) {
        res += arr[i] * pow;
        pow *= 2;
    }
    cout << res;
    return 0;
}