let split_on_char sep s =
  let r = ref [] in
  let j = ref (String.length s) in
  for i = String.length s - 1 downto 0 do
    if String.unsafe_get s i = sep then begin
      r := String.sub s (i + 1) (!j - i - 1) :: !r;
      j := i
    end
  done;
  String.sub s 0 !j :: !r;;

let pow x y =
  let rec inner_pow i result =
    match i with
    | 0 -> result
    | _ -> inner_pow (i - 1) (result * x) in
  inner_pow y 1;;

let rec shop_tumeru cost k hairu lst =
  match lst with
  | [] -> cost
  | _ ->
    let max_k = pow 2 k in
    if (hairu >= max_k) then shop_tumeru cost (k + 1) 0 lst
    else
      let next_shop = List.hd lst in
      let lst = List.tl lst in
      let cost = cost + (next_shop * k) in
      let hairu = hairu + 1 in
      shop_tumeru cost k hairu lst;;

let () =
  read_line () |> ignore;
  let lst = read_line () |> split_on_char ' ' |> List.map int_of_string |> List.fast_sort (fun x y -> - ( compare x y)) in
  shop_tumeru 0 0 0 lst |> print_int; print_newline ();;