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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    size_t N;
    std::cin >> N;
    std::vector<uint64_t> cals{};
    for(size_t n{0}; n<N; ++n)
    {
        uint64_t x;
        std::cin >> x;
        cals.emplace_back(x);
    }
    auto sortVal = [](const uint64_t x1, const uint64_t x2)
     {
        return x2<x1;  
    };
    std::sort(cals.begin(), cals.end(), sortVal);
    
    uint64_t mult{1};
    uint64_t totalMiles{0};
    for(uint64_t cal : cals)
    {
        totalMiles+=mult*cal;
        mult*=2;
        //std::cout << cal << " " << mult << " " << totalMiles << std::endl;
    }
    std::cout << totalMiles << std::endl;
    return 0;
}