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.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace ABC
{
    class MPCO2020A
    {
        const string FILE = "/tmp/data.txt";

        static void Main(string[] args)
        {
#if DEBUG
            Console.SetIn(new StreamReader(FILE));
#endif
            var N = RI();
            int result;
            if (N < 600)
            {
                result = 8;
            }
            else if (N < 800)
            {
                result = 7;
            }
            else if (N < 1000)
            {
                result = 6;
            }
            else if (N < 1200)
            {
                result = 5;
            }
            else if (N < 1400)
            {
                result = 4;
            }
            else if (N < 1600)
            {
                result = 3;
            }
            else if (N < 1800)
            {
                result = 2;
            }
            else
            {
                result = 1;
            }
            Console.WriteLine(result);


#if DEBUG
            Console.WriteLine("*** end ***");
            Console.SetIn(Console.In);
            Console.ReadKey();
            Console.WriteLine();
#endif
        }

        static int RI()
        {
            return int.Parse(Console.ReadLine());
        }

        static int[] RIa(int n)
        {
            string[] sa = Console.ReadLine().Split(' ');
            int[] la = new int[n];
            for (int i = 0; i < n; ++i)
            {
                la[i] = int.Parse(sa[i]);
            }
            return la;
        }
    }
}