mod io {
    #[macro_export]
    macro_rules! scan {
        ($r:expr, [$t:tt; $n:expr]) => ((0..$n).map(|_| scan!($r, $t)).collect::<Vec<_>>());
        ($r:expr, ($($t:tt),*)) => (($(scan!($r, $t)),*));
        ($r:expr, [u8]) => (io::scan($r));
        ($r:expr, String) => (io::scan($r).into_iter().map(char::from).collect::<String>());
        ($r:expr, $t:ty) => (scan!($r, String).parse::<$t>().unwrap());
    }

    pub fn scan<R: std::io::BufRead>(r: &mut R) -> Vec<u8> {
        let mut res = Vec::new();
        loop {
            let buf = match r.fill_buf() {
                Ok(buf) => buf,
                Err(e) if e.kind() == std::io::ErrorKind::Interrupted => continue,
                Err(e) => panic!(e), 
            };
            let (done, used) = match buf.iter().position(u8::is_ascii_whitespace) {
                Some(i) => {
                    res.extend_from_slice(&buf[..i]);
                    (res.len() > 0, i + 1)
                }
                None => {
                    res.extend_from_slice(buf);
                    (buf.is_empty(), buf.len())
                }
            };
            r.consume(used);
            if done { return res; }
        }
    }
}

fn run<R: std::io::BufRead, W: std::io::Write>(reader: &mut R, writer: &mut W) {
    let (n, x) = scan!(reader, (i32, i32));
    let c = scan!(reader, [i32; n]);

    let min = *c.iter().min().unwrap();
    let max = *c.iter().max().unwrap();
    if min <= x && x <= max {
        writer.write_all(b"Yes\n").ok();
    } else {
        writer.write_all(b"No\n").ok();
    }
}
 
fn main() {
    let (stdin, stdout) = (std::io::stdin(), std::io::stdout());
    let mut reader = std::io::BufReader::new(stdin.lock());
    let mut writer = std::io::BufWriter::new(stdout.lock());
    run(&mut reader, &mut writer);
}