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();
	let s = n[0] + n[1];
	let t = n[0].min(n[1]) * 2;
	println!(
		"{}",
		match s - t {
			f if t <= f => f - t,
			_ if s % 2 > 0 => 1,
			_ if s % 4 > 0 => 2,
			_ => 0,
		}
	)
}