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[] ar = new int[n];
        for(int i=0;i<n;i++)ar[i]=in.nextInt();
        Arrays.sort(ar);
        long mile=0;int tmp=0;
        for(int i=n-1;i>=0;i--)
            mile+=ar[i]*(long)Math.pow(2, tmp++);
        System.out.println(mile);
    }
}