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>
 
using namespace std;
 
#define f(i,a,b) for(int i=a;i<b;i++)
#define fll(i,a,b) for(ll i=a;i<b;i++)
#define rep(i,n) f(i,0,n)
#define fd(i,a,b) for(int i=a;i>=b;i--)
#define pb push_back
#define mp make_pair
#define vi vector< int >
#define vl vector< ll >
#define vvi vector<vector<int> >
#define ss second
#define ff first
#define ll long long
#define lld long double
#define pii pair< int,int >
#define pll pair< ll,ll >
#define sz(a) a.size()
#define inf (1000*1000*1000+5)
#define all(a) a.begin(),a.end()
#define tri pair<int,pii>
#define vii vector<pii>
#define vll vector<pll>
#define viii vector<tri>
#define mod (1000*1000*1000+7)
#define pq priority_queue< int >
#define pqll priority_queue< ll >
#define pdqueue priority_queue< int,vi ,greater< int > >
#define INF 1000000000
#define NINF -1000000000
#define endl '\n'

void solve(){

    ll grade[] = {400 , 600 , 800 , 1000 , 1200 , 1400 , 1600 , 1800};
    ll points[] = {8 , 7 , 6 , 5 , 4 , 3 , 2 , 1};
    ll a;
    cin >> a;
    ll temp = a%200;
    temp = a - temp;
    temp = (temp - 400) /200;
    cout << points[temp] << endl; 
}


int main(){

    #ifndef ONLINE_JUDGE 
  
    // For getting input from input.txt file 
    freopen("input.txt", "r", stdin); 
  
    // Printing the Output to output.txt file 
    freopen("output.txt", "w", stdout); 
  
    #endif 

    ios::sync_with_stdio(0);
    cin.tie(nullptr);
    cout.tie(nullptr);
    cerr.tie(nullptr);
 

    int t = 1;
    // cin >> t;
    
    for (int tt = 0 ; tt < t ; tt++){
        solve();
        // cout << "Case #" << (tt+1) <<":" << endl;
    }
}