Problem:
Score : 100 points

Problem Statement

Takahashi, who is A years old, is riding a Ferris wheel.

It costs B yen (B is an even number) to ride the Ferris wheel if you are 13 years old or older, but children between 6 and 12 years old (inclusive) can ride it for half the cost, and children who are 5 years old or younger are free of charge. (Yen is the currency of Japan.)

Find the cost of the Ferris wheel for Takahashi.

Constraints

0 ≤ A ≤ 100

2 ≤ B ≤ 1000

B is an even number.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the cost of the Ferris wheel for Takahashi.

Sample Input 1

30 100

Sample Output 1

100

Takahashi is 30 years old now, and the cost of the Ferris wheel is 100 yen.

Sample Input 2

12 100

Sample Output 2

50

Takahashi is 12 years old, and the cost of the Ferris wheel is the half of 100 yen, that is, 50 yen.

Sample Input 3

0 100

Sample Output 3

0

Takahashi is 0 years old, and he can ride the Ferris wheel for free.

Solution in Rust (1.15.1) (judge verdict: Accepted)

use std::io::{BufRead, StdinLock};

fn read(stdin_lock: &mut StdinLock, buf: &mut Vec<u8>, delimiter: u8) -> i32 {
    buf.clear();
    let l = stdin_lock.read_until(delimiter, buf).unwrap();
    buf.truncate(l - 1); // remove delimiter
    let s = unsafe { std::str::from_utf8_unchecked(&buf) };
    s.parse().unwrap()
}

fn main() {
    let stdin = std::io::stdin();
    let mut stdin_lock = stdin.lock();
    let mut buf: Vec<u8> = Vec::new();
    let a = read(&mut stdin_lock, &mut buf, b' ');
    let b = read(&mut stdin_lock, &mut buf, b'\n');
    println!("{}", solve(a, b));
}

fn solve(a: i32, b: i32) -> i32 {
    if a >= 13 {
        b
    } else if a >= 6 {
        b / 2
    } else {
        0
    }
}

#[test]
fn example1() {
    assert_eq!(100, solve(30, 100))
}

#[test]
fn example2() {
    assert_eq!(50, solve(12, 100))
}

#[test]
fn example3() {
    assert_eq!(0, solve(0, 100))
}