#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 */  
    long long n, i, res = 0;
    cin >> n;
    vector <long long> vec(n);
    for(i = 0; i < n; i++)
        cin >> vec[i];
    sort(vec.rbegin(), vec.rend());
    i = 0;
    for(auto x: vec)
        res += x*(1LL<<i), i++;
    cout << res;
    return 0;
}