<?php
[$n,$x] = explode(" ",trim(fgets(STDIN)));

$c[] = explode(" ",trim(fgets(STDIN)));

if(max($c) > $x && $min($c) < $x){
    echo "Yes";
}elseif($n == 1 && $x == $c[0]){
    echo "Yes";
}else{
    echo "No";
}

?>