#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
#define  ll long long int

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    ll n,i,j,c=0;
    cin >>n;
    ll a[n];
    for(i=0;i<n;i++)
        {
        cin >> a[i];
        
    }
    sort(a,a+n);
    for(i=0;i<n;i++)
        {
        //cin >> a[i];
        c+=(pow(2,i)*a[n-1-i]);
        //cout <<c<<" ";
    }
    cout <<c<<endl;
    return 0;
}