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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    unsigned long N;
    cin >> N;
    multiset<unsigned long> ck;
    unsigned long tmp;
    for (unsigned long i = 0; i < N; i++)
        {
        cin >> tmp;
        ck.insert(tmp);
    }
    multiset<unsigned long>::reverse_iterator it = ck.rbegin();
    unsigned long res = 0;
    unsigned long cnt = 1;
    while (it != ck.rend())
        {
        res += *it * cnt;
        it++;
        cnt <<=1;
    }
    cout << res << endl;
    
    
    return 0;
}