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();
        }
        // your code goes here
      System.out.println(compute(calories));
    }
  
  public static long compute(int[] arr) {
    Arrays.sort(arr);

    long result = 0;
    int numEaten = 0;
    for (int i = arr.length - 1; i >= 0; i--) {
      int curr = arr[i];
      //System.out.println("curr: "+ curr);
      //System.out.println("numEaten: " + numEaten);
      result += Math.pow(2, numEaten) * curr;
      numEaten++;
    }
    
    return result;
  }
}