(define x (read))
(define y (read))
(define l (read))

(define turn
  (lambda (x y)
    (cond ((and (zero? x) (>= y 0)) 0)
          ((and (>= y 0)) 1)
          (else 2))))
(define mo
  (lambda (x) (if (zero? x)
                  0
                  1)))

(print (+ (turn x y) (div (abs x) l) (div (abs y) l) (mo (modulo x l)) (mo (modulo y l))))