import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;
class Main{
  public static void main(String[] args){
    Scanner scan=new Scanner(System.in);
    int n,ans=0,cnt=0,N,a=1;
    n=Integer.parseInt(scan.next());
    N=n;
    Integer[] A=new Integer[n];
    for(int i=0;i<n;i++)A[i]=Integer.parseInt(scan.next());
    Arrays.sort(A,Collections.reverseOrder());
    for(int i=0;i<17;i++){
      a=Math.min(a,N);
      for(int j=0;j<a;j++){
        ans+=i*A[cnt++];
      }
      N-=a;
      a*=2;
      if(N<=0)break;
    }
    System.out.println(ans);
  }
}