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: Wrong Answer)

<?php
// fscanf(STDIN, "%d", $n);
// $a = explode(" ", fgets(STDIN));
// $a = array_map('intval', $a);
// $b = explode(" ", fgets(STDIN));
// $b = array_map('intval', $b);

// $str = fgets(STDIN);
// $arr = explode("n", $str);
// var_dump($arr); 
// $array = str_replace('\n', ' ', fgets(STDIN));
// $array = explode(' ', $array);
// print_r($array);

fscanf(STDIN, "%d", $x);
if ($x >= 800 && $x <= 999) {
    echo 8;
} elseif ($x >= 600 && $x <= 799) {
    echo 7;
} elseif ($x >= 800 && $x <= 999) {
    echo 6;
} elseif ($x >= 1000 && $x <= 1199) {
    echo 5;
} elseif ($x >= 1200 && $x <= 1399) {
    echo 4;
} elseif ($x >= 1400 && $x <= 1599) {
    echo 3;
} elseif ($x >= 1600 && $x <= 1799) {
    echo 2;
} elseif ($x >= 1800 && $x <= 1999) {
    echo 1;
}



// [$L, $R, $d] = fscanf(STDIN, "%d%d%d");
// $ans = 0;
// for ($i = $L; $i <= $R; $i++) {
//     if ($i % $d === 0) {
//         $ans++;
//     }
// }

// echo $ans;