fn main() {
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: Vec<usize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    println!("{}", if a[0] < a[1] && a[2] > a[3] { "YES" } else { "NO" });
}