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 sc = new Scanner(System.in);
		int n = sc.nextInt();
		
		ArrayList<Long> list = new ArrayList<Long>();
		for(int i= 0; i< n; i++) {
			list.add(sc.nextLong());
		}
		
		Collections.sort(list);
		
		long sum = 0;
		int j= 0;
		
		for(int i= n-1; i >= 0; i--) {
			
			sum = sum + list.get(i)* (long)Math.pow(2,j);
			
			j++;
		}
		
		System.out.println(sum);
	}
}