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: Runtime Error)

fn main() {
    let mut buf = String::new();
    std::io::stdin().read_line(&mut buf).unwrap();
    let mut input = buf.split_whitespace();
    let (r, d, x2000) = (
        input.next().unwrap().parse().unwrap(),
        input.next().unwrap().parse().unwrap(),
        input.next().unwrap().parse().unwrap(),
    );

    for i in doa(r, d, x2000) {
        println!("{}", i);
    }
}

fn doa(r: u64, d: u64, x2000: u64) -> Vec<u64> {
    let mut v = Vec::with_capacity(10);
    let mut xi = x2000;
    for _ in 0..10 {
        xi = r * xi - d;
        v.push(xi)
    }
    v
}