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 C# (.NET Core 3.1.201) (judge verdict: Wrong Answer)

using System;
using System.Threading;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Text;
using System.Linq;

class Project
{
    static void Main(string[] args)
    {
        double N = int.Parse(Console.ReadLine());
        double n = Math.Floor(N / 200); 
        if (n == 2)
        {
            Console.WriteLine("8級");
        }
        else if (n == 3)
        {
            Console.WriteLine("7級");
        }
        else if (n == 4)
        {
            Console.WriteLine("6級");
        }
        else if (n == 5)
        {
            Console.WriteLine("5級");
        }
        else if (n == 6)
        {
            Console.WriteLine("4級");
        }
        else if (n == 7)
        {
            Console.WriteLine("3級");
        }
        else if (n == 8)
        {
            Console.WriteLine("2級");
        }
        else if (n == 9)
        {
            Console.WriteLine("1級");
        }
    } 
}