import java.util.*;

public class Solution {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		int[] calories = new int[n];
		for (int calories_i = 0; calories_i < n; calories_i++) {
			calories[calories_i] = -in.nextInt();
		}
		in.close();
		Arrays.sort(calories);
		System.out.println(getCalorieCount(calories));

	}

	private static long getCalorieCount(int[] calories) {
		long res = 0L;
		for (int j = 0; j < calories.length; j++)
			res += Math.pow(2, j) * -calories[j];

		return res;
	}
}