let iota ?(start=0) ?(step=1) cnt =
  let rec doit i acc =
    if i <= 0 then acc
    else doit (i - 1) (start + step*(i - 1) :: acc) in
  doit cnt []

let () =
  let n, m = Scanf.scanf "%d %d " (fun n m -> n, m) in
  let l = iota ~start:1 n in
  let rec doit i l =
    if i = m then l
    else
      let a = Scanf.scanf "%d " (fun i -> i) in
      let a = a - 1 in
      let rec aux j xs = function
        | [] -> assert false
        | hd :: tl ->
          if j = a then hd :: List.rev_append xs tl
          else aux (j + 1) (hd :: xs) tl in
      aux 0 [] l |> doit (i + 1) in
  match doit 0 l with
  | [] -> assert false
  | hd :: _ -> Printf.printf "%d\n" hd