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


int main()
    {
    ll n,i,j,miles=0;
    cin>>n;
    vector<ll> v(n);
    for(i=0;i<n;i++)
        cin>>v[i];
    sort(v.begin(),v.end());
    reverse(v.begin(),v.end());
    for(i=0;i<n;i++)
        miles=miles+(v[i]<<i);
    cout<<miles<<endl;
}