let split_on_char sep s =
  let r = ref [] in
  let j = ref (String.length s) in
  for i = String.length s - 1 downto 0 do
    if String.unsafe_get s i = sep then begin
      r := String.sub s (i + 1) (!j - i - 1) :: !r;
      j := i
    end
  done;
  String.sub s 0 !j :: !r;;

let are ar = (ar.(0) < ar.(1)) && (ar.(2) > ar.(3));;

let () =
  let raw = read_line () |> split_on_char ' ' |> List.map int_of_string
            |> Array.of_list in
  (if (are raw) then "YES" else "NO")|> print_string ; print_newline ();;