let solve n =
  let len_n = String.length n in
  let rec solve' i result =
    if i >= len_n then
      result
    else
      let d =
        match n.[i] with
        | '0' | '4' |'6' |'9' -> 1
        | '8' -> 2
        | _ -> 0
      in
      solve' (i + 1) (result + d)
  in
  solve' 0 0
  |> fun r -> len_n * 2 + 1 + r

let () =
  let n = read_line () in
  solve n
  |> string_of_int
  |> print_endline