use std::io::Read;

macro_rules! tok { ($iter: expr) => { $iter.next().unwrap().parse().unwrap() } }

fn main() {
    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();
    let mut iter = buf.split_whitespace();
    let n: usize = tok!(iter);
    let x: u64 = tok!(iter);
    let cs: Vec<u64> = (0..n).map(|_| tok!(iter)).collect();

    let ans = if n == 1 {
        x == cs[0]
    } else {
        cs[0] <= x && x <= cs[n-1]
    };
    println!("{}", if ans { "Yes" } else { "No" });
}