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 Ruby (2.7.1) (judge verdict: Accepted)

n = gets.to_i
r = 0
if 400 <= n && n <= 599
  r = 8
elsif 600 <= n && n <= 799
  r = 7
elsif 800 <= n && n <= 999
  r = 6
elsif 1000 <= n && n <= 1199
  r = 5
elsif 1200 <= n && n <= 1399
  r = 4
elsif 1400 <= n && n <= 1599
  r = 3
elsif 1600 <= n && n <= 1799
  r = 2
elsif 1800 <= n && n <= 1999
  r = 1
end

puts r.to_s