import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.util.*;

public class Solution {

	public static void main(String[] args) {
		FastReader in = new FastReader();
		PrintWriter out = new PrintWriter(new BufferedOutputStream(System.out), true);
		int n = in.nextInt();
		int[] arr = new int[n];
		for(int i=0;i<n;i++){
			arr[i] = (-1)*in.nextInt();
		}
		Arrays.sort(arr);
		long sum = 0;
		for(int i=0;i<n;i++){
			sum = sum + (long)((-1)*(arr[i])*(long)Math.pow(2,i));
		}
		out.println(sum);
	}
	
	static class FastReader
    {
        BufferedReader br;
        StringTokenizer st;
 
        public FastReader()
        {
            br = new BufferedReader(new
                     InputStreamReader(System.in));
        }
 
        String next()
        {
            while (st == null || !st.hasMoreElements())
            {
                try
                {
                    st = new StringTokenizer(br.readLine());
                }
                catch (IOException  e)
                {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
 
        int nextInt()
        {
            return Integer.parseInt(next());
        }
 
        long nextLong()
        {
            return Long.parseLong(next());
        }
 
        double nextDouble()
        {
            return Double.parseDouble(next());
        }
 
        String nextLine()
        {
            String str = "";
            try
            {
                str = br.readLine();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            return str;
        }
    }


	
}