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();
        }
        for(int i=0;i<n;i++)
            {
            for(int j=0;j<n-1-i;j++)
                {
                if(calories[j]>calories[j+1])
                    {
                    int t=calories[j];
                    calories[j]=calories[j+1];
                    calories[j+1]=t;                    
                }
                
            }}
            long sum=0,p=0;
            for(int k=n-1;k>=0;k--,p++)
                {
                sum=(long)(sum+(calories[k]*(Math.pow(2,p))));
                
            }
           System.out.println(sum); 
        
        // your code goes here
    }
}