#include <iostream>
#include <vector>
#include <functional>
#include <algorithm>

int main()
{
    int cup_cakes;
    std::vector<int> calories;

    std::cin >> cup_cakes;
    calories.resize(cup_cakes);
    for (int i = 0; i < cup_cakes; ++i)
    {
	std::cin >> calories[i];
    }

    std::sort(calories.begin(), calories.end(), std::greater<int>());

    long long ans = 0;
    for (int i = 0; i < cup_cakes; ++i)
    {
	ans += (1L << i) * calories[i];
    }

    std::cout << ans << std::endl;
    return 0;
}