(define (System.out.println x)
  (begin
    (display x)
    (newline)
  )
)

(define (TurnOrder X Y)
  (cond
    ((< Y 0) 2)
    ((> (abs X) 0) 1)
    (else 0)
  )
)

(let (
      (X (read))
      (Y (read))
      (L (read))
     )
  (System.out.println (+ (ceiling (/ (abs Y) L)) (ceiling (/ (abs X) L)) (TurnOrder X Y)))
)