fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let v: Vec<u8> = s.split_whitespace().flat_map(str::parse).collect();
	let m = v[0].max(v[1]);
	let a = (m + 4) % 12;
	println!("{}", if v.contains(&a) { m - 4 } else { a });
}