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: Accepted)

using System;
using System.Runtime.InteropServices;

namespace atcoder_2
{
    class Class1
    {

        static void Main(string[] args)
        {
            int X = int.Parse(Console.ReadLine());
            X -= 400;
            if (X / 200 == 0){
                Console.WriteLine(8);
            }
            else if (X / 200 == 1)
            {
                Console.WriteLine(7);
            }
            else if (X / 200 == 2)
            {
                Console.WriteLine(6);
            }
            else if (X / 200 ==3)
            {
                Console.WriteLine(5);
            }
            else if (X / 200 == 4)
            {
                Console.WriteLine(4);
            }
            else if (X /200 == 5)
            {
                Console.WriteLine(3);
            }
            else if (X/200 == 6)
            {
                Console.WriteLine(2);
            }
            else if (X / 200 == 7)
            {
                Console.WriteLine(1);
            }
        }
    }
}