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 h[] = new int[n];
		
		for (int i=0;i<n;i++){
			h[i] = in.nextInt();
		}
		
		Arrays.sort(h);
		
		long ans = 0;
		int j = 0;
		for (int i=n-1;i>=0;i--){
			long p = (long)(Math.pow(2, j));
			p = p * h[i];
			ans = ans + p;
			
			j++;
		}
		System.out.println(ans);
		
		
		
		
		
		in.close();
    }
}