import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

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();
		}

		Arrays.sort(calories);

		long result = 0;

		for (int i = 0; i < calories.length; i++) {
			result += calories[i] * Math.pow(2, calories.length - i - 1);
		}
		System.out.println(result);
	}
}