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: Runtime Error)


using System;
using System.Text.Json;

class Program
{
    static void Main(string[] args)
    {
        string[] strs = Console.ReadLine().Split(' ');
        int[] num = new int[strs.Length];
        for (int i = 0; i < num.Length; i++)
        {
            num[i] = int.Parse(strs[i]);
        }

        int k = int.Parse(Console.ReadLine());

        for(int i = 0; i < k; i++) 
        {


            if (num[2] <= num[1] || num[2] <= num[0])
            {
                num[2] *= 2;
                continue;
            }
            else if (num[1] <= num[0])
            {
                num[1] *= 2;
                continue;
            }
        }

        if (num[0] < num[1] && num[1] < num[2])
            Console.WriteLine("Yes");
        else
            Console.WriteLine("No");







    }

}