fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let n: Vec<u8> = s.split_whitespace().flat_map(str::parse).collect();
	println!(
		"{}",
		match 2 * n[0] {
			x if x == n[1] || n[0] == n[1] => 4,
			x if x < n[1] || n[0] > n[1] => 0,
			_ => 8,
		}
	)
}