import java.util.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Solution {
	public static void main(String[] args) {
		ReadIO sc = new ReadIO();
		int n = sc.nextInt();
		int[] a = sc.nextArray(n);
		Arrays.sort(a);
        long ans = 0;
        for(int i=n-1;i>-1;i--){
            ans += ((long)a[i]*(long)Math.pow(2,n-1-i));
        }
        System.out.println(ans);
	}
}

class ReadIO {
	BufferedReader br;
	StringTokenizer st;

	public ReadIO() {
		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();
	}

	char nextChar() {
		return next().charAt(0);
	}

	int nextInt() {
		return Integer.parseInt(next());
	}

	long nextLong() {
		return Long.parseLong(next());
	}

	double nextDouble() {
		return Double.parseDouble(next());
	}

	String nextLine() {
		String line = null;
		try {
			line = br.readLine();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return line;
	}

	int[] nextArray(int n) {
		int i = 0;
		int[] a = new int[n];
		while (i < n) {
			a[i] = nextInt();
			i++;
		}
		return a;
	}

	String[] nextStringArray(int n) {
		int i = 0;
		String[] a = new String[n];
		while (i < n) {
			a[i] = next();
			i++;
		}
		return a;
	}

	void printArray(Object[] a, int method) {
		int n = a.length;
		for (int i = 0; i < n; i++) {
			if (method == 0) {
				System.out.print(a[i] + " ");
			} else {
				System.out.println(a[i]);
			}
		}
		if (method == 0) {
			System.out.println();
		}
	}
}