(defun main (&rest argv)
  (declare (ignorable argv))
  (let* ((n (read))
         (dist (make-array 10001 :initial-element 0))
         (visited (make-array 10001 :initial-element nil))
         (deque (make-array 400000 :element-type 'integer))
         (front-index 200000)
         (rear-index 200000))
    (setf (aref visited 1) t)
    (setf (aref deque rear-index) 1
          rear-index (1+ rear-index))
    (loop while (< front-index rear-index)
          do (let* ((p 0)
                    (x (aref deque front-index))
                    (m x))
               (incf front-index)
               (loop while (/= m 0)
                     do (incf p (logand m 1))
                        (setf m (ash m -1)))
               (let ((ip (+ x p))
                     (im (- x p)))
                 (when (and (<= ip n) (not (aref visited ip)))
                       (setf (aref visited ip) t
                             (aref dist ip) (1+ (aref dist x))
                             (aref deque rear-index) ip
                             rear-index (1+ rear-index)))
                 (when (and (> im 0) (not (aref visited im)))
                       (setf (aref visited im) t
                             (aref dist im) (1+ (aref dist x))
                             (aref deque rear-index) im
                             rear-index (1+ rear-index))))))
    (format t "~d~%" (if (aref visited n)
                         (1+ (aref dist n))
                         -1))))

(main)