import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

public class ck {

	public static void main(String[] args){
		Scanner in = new Scanner(System.in);
		
		int n = in.nextInt();
		in.nextLine();
		
		ArrayList<Integer> list = new ArrayList<Integer>();
		
		int arr[] = new int[n];
		for(int i = 0;i<n;i++){
			arr[i] = in.nextInt();
		}
		
		Arrays.sort(arr);
		
		long ans = 0;
		int j = 0;
		for(int i = n-1;i>=0;i--){
			ans += Math.pow(2, j)*arr[i];
            j++;
		}
		
		System.out.println(ans);
		
	}
	
}