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: Wrong Answer)

#include <stdio.h>

int main(void) {
    int x;
    scanf("%d", &x);
    if (x >= 400 & x <= 1999) {
    if (x >= 400 & x < 599)
        printf("8");
    if (x >= 600 & x < 799)
        printf("7");;
    if (x >= 800 & x < 999)
        printf("6");
    if (x >= 1000 & x < 1199)
        printf("5");
    if (x >= 1200 & x < 1399)
        printf("4");
    if (x >= 1400 & x < 1599)
        printf("3");
    if (x >= 1600 & x < 1799)
        printf("2");
    if (x >= 1800 & x <= 1999)
        printf("1");
    }
    else
    {
    printf("input error");
    }
    return 0;
}