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++ (GCC 9.2.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define REP(i, n) for (int i = (n - 1); i >= 0; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;
const int INF = 1000000007;

int main(){
int x;
  cin>>x;
  if(x>=400 && x<=599){
    cout<<8<<endl;
  }else if(x>=600 &&x<= 799){
    cout<<7<<endl;
  }else if(x>=800 && x<=999){
    cout<<6<<endl;
    }
  else if(x>=1000 && x<=1199){
    cout<<5<<endl;
  }else if(x>=1200 && x<=1399){
    cout<<4<<endl;
  }else if(x>=1800 && x<=1999){
    cout<<1<<endl;
  }else if(x>=1600 && x<=1799){
    cout<<2<<endl;
  }else if(x>=1400 && x<=1599){
    cout<<3<<endl;
  }
}