import javax.security.sasl.SaslClient;
import java.util.Arrays;
import java.util.Scanner;

/**
 * Created by Tejas on 14-02-2017.
 */
public class Marc_Cupcake {
    public  static  void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);

        int n=sc.nextInt();
        int a[]=new int[n];

        for(int i=0;i<n;i++)
        {
            a[i]=sc.nextInt();
        }
        Arrays.sort(a);
        long sum=0;

        for(int i=n-1;i>=0;i--)
        {
            sum=sum+(long)Math.pow(2,n-1-i)*a[i];
        }
        System.out.println(sum);
    }
}