(defun main (&rest argv)
  (declare (ignorable argv))
  (let* ((n (read))
         (x (make-array n :element-type 'integer))
         (y (make-array n :element-type 'integer))
         (res 0))
    (dotimes (i n)
      (setf (aref x i) (read)
            (aref y i) (read)))
    (dotimes (i n)
      (dotimes (j i)
        (let ((a 0))
          (dotimes (k n)
            (incf a (if (zerop (- (* (- (aref x k) (aref x j)) (- (aref y i) (aref y j)))
                                  (* (- (aref x i) (aref x j)) (- (aref y k) (aref y j)))))
                        1
                        0)))
          (setq res (max res a)))))
    (format t "~d~%" res)))

(main)