use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let a: Vec<usize> = (0..4)
        .map(|_| itr.next().unwrap().parse().unwrap())
        .collect();

    println!(
        "{}",
        if a[0] < a[1] && a[2] > a[3] {
            "YES"
        } else {
            "NO"
        }
    );
}