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 other l = iota 10 |> List.filter (fun e -> not (List.mem e l))

let () =
  let t = Array.make 10 true in
  let n = Scanf.scanf "%d " (fun i -> i) in
  for i = 0 to n - 1 do
    let a, b, c, d, r =
      Scanf.scanf "%d %d %d %d %s " (fun a b c d r -> a, b, c, d, r) in
    let l = [a; b; c; d] in
    List.iter (fun e -> t.(e) <- false) (if r = "NO" then l else other l)
  done;
  let rec doit i =
    if t.(i) then i
    else doit (i + 1) in
  doit 0 |> Printf.printf "%d\n"