fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let mut itr = s.trim().split_ascii_whitespace();
    let mut a: usize = itr.next().unwrap().parse().unwrap();
    let mut b: usize = itr.next().unwrap().parse().unwrap();

    if a == b || (a, b) == (2, 4) || (a, b) == (4, 2) {
        println!("Yes");
    } else {
        println!("No");
    }
}