let solve n =
  let rec solve' m result =
    if m <= 0 then result
    else
      let d = m / 7
      and r = m mod 7
      in
      solve' d (r :: result)
  in
  if n <= 0 then "0"
  else
    solve' n []
    |> List.fold_left (fun s i -> s ^ (string_of_int i)) ""

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