(defun main (&rest argv)
  (declare (ignorable argv))
  (let* ((n (read))
         (a (read))
         (b (read))
         (c (read))
         (n/a (floor n a))
         (n/b (floor n b))
         (n/c (floor n c))
         (-n/ab (- (floor n (lcm a b))))
         (-n/bc (- (floor n (lcm b c))))
         (-n/ca (- (floor n (lcm c a))))
         (n/abc (floor n (lcm a b c))))
    (format t "~d~%" (+ n/a n/b n/c -n/ab -n/bc -n/ca n/abc))))

(main)