let () =
  let l, n = Scanf.scanf "%d %d " (fun l n -> l, n) in
  let w = Array.init n (fun _ -> Scanf.scanf "%d " (fun i -> i)) in
  Array.fast_sort (-) w;
  for i = 1 to n - 1 do
    w.(i) <- w.(i) + w.(i-1)
  done;
  let rec doit i =
    if i = n || w.(i) > l then i
    else doit (i + 1) in
  doit 0 |> Printf.printf "%d\n"