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 PHP (7.4.4) (judge verdict: Accepted)

<?php

$x = trim(fgets(STDIN));
$eight = range(400,599);
$seven = range(600,799);
$six   = range(800,999);
$five  = range(1000,1199);
$four  = range(1200,1399);
$three = range(1400, 1599);
$two   = range(1600, 1799);
$one   = range(1800, 1999);

switch ($x){
    case in_array($x, $eight):
        echo "8";
        break;
    case in_array($x, $seven):
        echo "7";
        break;
    case in_array($x, $six):
        echo "6";
        break;
    case in_array($x, $five):
        echo "5";
        break;
    case in_array($x, $four):
        echo "4";
        break;
    case in_array($x, $three):
        echo "3";
        break;
    case in_array($x, $two):
        echo "2";
        break;
    case in_array($x, $one):
        echo "1";
        break;
}