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, } ) }