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

fn main() {
    run();
}