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

bool comp(int a,int b)
{
    return a > b;
}

int main() {
    
    int n;
    cin >> n;
    vector<int> v(n);
    for(int i = 0;i<n;i++)
        cin >> v[i];
    
    sort(v.begin(),v.end(),comp);
    
    unsigned long long int miles = 0L;
    
    for(int i = 0;i<v.size();i++)
    {
        miles += (v[i] * pow(2,i));
    }
    
    cout << miles << endl;
    
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}