(let* ((n (read))
       (m (read))
       (p (read))
       (q (read))
       (r (rlet1 v 
                 (make-vector 12 1)
                 (let loop ((i p) 
                            (j (- (+ p q) 1)))
                           (unless (> i j)
                             (begin 
                               (set! (~ v (- i 1)) 2)
                               (loop (+ i 1) j))))))
       (result (let loop ((rest n)
                          (a 0)
                          (a1 0))
                         (let1 rest1 
                               (- rest 
                                  (* m 
                                     (~ r a1))) 
                               (if (<= rest1 0)
                                   (+ a 1)
                                   (loop rest1 (+ a 1) (if (= 11 a1) 0 (+ a1 1))))))))
      (print result))