import java.util.Arrays;
import java.util.Scanner;

/**
 * Created by User on 11/02/2017.
 */
public class Marathon2 {


    public static void main(String[] args) {
        runner();
    }


    private static void runner() {
        Scanner in = new Scanner(System.in);

        int N = in.nextInt();

        int[] array = new int[N];

        for (int i=0; i<N; i++){
            array[i] = in.nextInt();
        }

        Arrays.sort(array);

        long min=0;

        for (int i=N-1; i>=0; i--){
          min+=array[i]*Math.pow(2,N-i-1);
        }

        System.out.println(min);
    }

}