fn main() {
    let nx: Vec<usize> = read_vec();
    let c: Vec<usize> = read_vec();

    let x = nx[1];
    let cmin = c[0];
    let &cmax = c.last().unwrap();

    if cmin <= x && cmax >= x {
        println!("Yes");
    } else {
        println!("No");
    }
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>().split_whitespace()
        .map(|e| e.parse().ok().unwrap()).collect()
}