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)

use std::io::*;
use std::str::FromStr;
use std::collections::BinaryHeap;

fn main() {
    let n: usize = read();
    let m: usize = read();
    
    let mut a: BinaryHeap<i64> = BinaryHeap::new();
    for i in 0..n {
        let ai: i64 = read();
        a.push(-ai);
    }

    for i in 0..m {
        let b: usize = read();
        let c: i64 = read();

        let mut cnt = 0;
        while cnt < b {
            if let Some(po) = a.pop() {
                if c > -po {
                    a.push(-c);
                    cnt += 1;
                } else {
                    a.push(po);
                    break;
                }
            }
        }
    }

    let mut sum: i64 = 0;
    while let Some(po) = a.pop() {
        sum -= po;
    }
    println!("{}", sum);
}

fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.unwrap() as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().unwrap()
}