fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let v: Vec<i16> = s.trim().split_whitespace().map(|e| e.parse().ok()
		.unwrap()).collect();
	if v[0] < v[1] && v[2] > v[3] { println!("YES"); }
	else {println!("NO"); }
}