fn main() {
    let mut xx = String::new();
    std::io::stdin().read_line(&mut xx).ok();
    let xx: Vec<u64> = xx.split_whitespace().flat_map(str::parse).collect();

    if 2 * xx[0] < xx[1] {
        println!("0");
    } else if 2 * xx[0] == xx[1] {
        println!("4");
    } else if xx[0] < xx[1] {
        println!("8");
    } else if xx[0] == xx[1] {
        println!("4");
    } else {
        println!("0");
    }
}