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[] cal = new int[n];
        for(int i=0; i < n; i++){
            cal[i] = in.nextInt();
        }
        Arrays.sort(cal);
        long miles=0,p=0;
        for(int i=n-1;i>=0;i--)
            {
            miles=miles+(long)(cal[i]*Math.pow(2,p++));
        }
        // your code goes here
        System.out.println(miles);
    }
}