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();
        }
        long result = attempt1(n, calories);
        System.out.print(result + "\n");
    }
    
    public static long attempt1(int n, int[] calories){
        long returnValue = 0L;
        Arrays.sort(calories);
        //System.out.print("Arrays.toString() = " + Arrays.toString(calories) + "\n");
        long minMiles = 0L;
        double numEaten = 0;
        for(int index = calories.length - 1; index >= 0; index--){
            //System.out.print("index " + index + " = " + calories[index] + "\n");
            minMiles = minMiles + ((long) (calories[index] * Math.pow(2, numEaten)));
            numEaten++;
        }
        
        return minMiles;
    }
}