(defun main ()
  (let* ((a (read))
         (b (read))
         (c (read))
         (d (read))
         (result (- 31 (- a b))))
    (cond
      ((< result d) (format t "~d~%" 3))
      ((and (>= result d) (<= result c)) (format t "~d~%" 2))
      ((> result c) (format t "~d~%" 1)))))

(main)