Problem:
Score: 100 points

Problem Statement

M-kun is a competitor in AtCoder, whose highest rating is X.

In this site, a competitor is given a kyu (class) according to his/her highest rating. For ratings from 400 through 1999, the following kyus are given:

From 400 through 599: 8-kyu

From 600 through 799: 7-kyu

From 800 through 999: 6-kyu

From 1000 through 1199: 5-kyu

From 1200 through 1399: 4-kyu

From 1400 through 1599: 3-kyu

From 1600 through 1799: 2-kyu

From 1800 through 1999: 1-kyu

What kyu does M-kun have?

Constraints

400 \leq X \leq 1999

X is an integer.

Input

Input is given from Standard Input in the following format:

X

Output

Print the kyu M-kun has, as an integer.
For example, if he has 8-kyu, print 8.

Sample Input 1

725

Sample Output 1

7

M-kun's highest rating is 725, which corresponds to 7-kyu.

Thus, 7 is the correct output.

Sample Input 2

1600

Sample Output 2

2

M-kun's highest rating is 1600, which corresponds to 2-kyu.

Thus, 2 is the correct output.

Solution in Common Lisp (SBCL 2.0.3) (judge verdict: Wrong Answer)

(defun main ()
  (let ((x (read))
	(ans))
    (cond ((and (<= 400 x) (>= 599 x)) (setf ans 8))
	  ((and (<= 600 x) (>= 799 x)) (setf ans 7))
	  ((and (<= 800 x) (>= 999 x)) (setf ans 6))
	  ((and (<= 1000 x) (>= 1199 x)) (setf ans 5))
	  ((and (<= 1200 x) (>= 1399 x)) (setf ans 4))
	  ((and (<= 1400 x) (>= 1599 x)) (setf ans 3))
	  ((and (<= 1600 x) (>= 1799 x)) (setf ans 2))
	  (t (setf ans 1)))
    (format t "~a~%" ans)))