fn main() {
    use std::io::Read;
    let mut input = String::new();
    std::io::stdin().read_to_string(&mut input).unwrap();
    let mut iter = input.split_whitespace();
    let a : usize = iter.next().unwrap().parse().unwrap();
    let b : usize = iter.next().unwrap().parse().unwrap();

    if a == b || 2 * a == b { print!("4\n") }
    else if b < a || 2 * a < b  { print!("0\n") }
    else { print!("8\n") }
}