#include<iostream>
#include<cmath>
using namespace std;
int main()
    {
    int n;
    cin >> n;
    long long int count = 0;
    int arr[n];
    for(int i=0;i<n;i++)
        {
        cin >> arr[i];
    }
    for(int i=0;i<n;i++)
        {
        for(int j=i+1;j<n;j++)
            {
            if(arr[i] < arr[j])
                {
                int temp = arr[i];
                arr[i] = arr[j];
                arr[j] = temp;
            }
        }
    }
    for(int i=0;i<n;i++)
        {
        count = count + (pow(2,i)*arr[i]);
        //ut << count << endl;
    }
    cout << count;
}