fn getline() -> String {
    let mut _ret = String::new();
    std::io::stdin().read_line(&mut _ret).ok();
    return _ret.trim().to_string();
}

fn main() {
    let binding = getline();
    let s = binding.as_str();

    let check_digit = s.chars().nth(0).unwrap();
    if check_digit == '4' || check_digit == '5' {
        println!("Yes");
    } else {
        println!("No");
    }
}