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


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