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 Julia (1.4.0) (judge verdict: Accepted)

# %% constants
# ------------

# %% body
# -------

function main(io = stdin)
    readto(target = '\n') = readuntil(io, target)
    readnum(T::Type{<:Number} = Int; dlm = isspace, kwargs...) =
        parse.(T, split(readto(), dlm; kwargs...))

    # handle IO and solve
    X, = readnum()
    println(solve(X))
end

function solve(X)
    if 400 ≤ X ≤ 599
        8
    elseif 600 ≤ X ≤ 799
        7
    elseif 800 ≤ X ≤ 999
        6
    elseif 1000 ≤ X ≤ 1199
        5
    elseif 1200 ≤ X ≤ 1399
        4
    elseif 1400 ≤ X ≤ 1599
        3
    elseif 1600 ≤ X ≤ 1799
        2
    elseif 1800 ≤ X ≤ 1999
        1
    else
        nothing
    end
end

@static if @isdefined(Juno)
    main(open(replace(@__FILE__, r"(.+)\.jl" => s"\1.in")))
else
    main()
end