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

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        int[] a = new int[n];
        for (int i = 0; i < n; i++)
            a[i] = scan.nextInt();
        Arrays.sort(a);
        int x = 0;
        long res = 0;
        for (int i = n-1; i >= 0; i--) {
            res += Math.pow(2, x) * a[i];
            x++;
        }
        System.out.println(res);
    }

}