(defun main (&rest argv)
  (declare (ignorable argv))
  (let* ((a1 (read))
         (a2 (read))
         (a3 (read))
         (a4 (read)))
    (format t "~a~%" (if (and (< a1 a2) (> a3 a4))
                         "YES"
                         "NO"))))

(main)