module String = struct
  include String

  (* @since 4.02.0 *)
  let init n f =
    let s = String.create n in
    for i = 0 to n - 1 do
      s.[i] <- f i
    done;
    s

end

let () =
  let n = read_int () in
  print_endline
    (if n mod 2 = 0 then String.init (n / 2) (fun _ -> '1')
     else "7" ^ String.init (n / 2 - 1) (fun _ -> '1'))