import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Scanner;
import java.util.StringTokenizer;

public class Solution {
	public static final int inf = 10000000;

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		FastReader in=new FastReader();
		int n=in.nextInt();
		int[]cost=new int[n];
		for(int i=0;i<n;i++){
			cost[i]=in.nextInt();
		}
		Arrays.sort(cost);
		int j=0;
		long miles=0;
		for(int i=n-1;i>=0;i--){
			miles+=Math.pow(2, j)*cost[i];
			j++;
		}
		System.out.println(miles);
		
	}

	public 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;
		}
	}

}