#include <bits/stdc++.h>
#include<algorithm>
#include<math.h>
using namespace std;

int main(){
    long long int n;
    cin >> n;
    long long int c[n];
    for(long long int calories_i = 0; calories_i < n; calories_i++){
       cin >> c[calories_i];
    }
    sort(c,c+n);
    long long int l=0;
    long long int sum=0;
    for(long long int i=n-1;i>=0;i--)
        {
        sum=sum+c[i]*pow(2,l);
        l++;
    }
    cout<<sum;
    // your code goes here
    return 0;
}