import java.util.*;

/**
 * Created by dhairyathakkar on 14-02-2017.
 */
public class Contest101Hack_1 {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int c[]=new int[n];
        for(int i=0;i<n;i++){
            c[i]=sc.nextInt();
        }
        Arrays.sort(c);
        long miles=0;
        int c1=0;
        for(int i=n-1;i>=0;i--){
            miles+=(c[i]*Math.pow(2,c1));
            c1++;
        }
        System.out.println(miles);
    }
}