#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
typedef unsigned long long big_t;

int main() {
    int n;
    cin >> n;
    vector<int> cc(n);
    for (auto&& c : cc)
        cin >> c;
    sort(cc.begin(), cc.end(), greater<int>());
    big_t m = 0, dm = 1;
    for (auto c : cc)
    {
        m += c * dm;
        dm <<= 1;
    }
    cout << m << endl;
    return 0;
}