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

$c[] = explode(" ",trim(fgets(STDIN)));
$a = 0;
$b = 0;
$d = 0;

for ($i = 0; $i < $n ; $i++) {
     if ($c[$i] > $x) {
         $a++;
     }elseif($c[$i] == $x){
         $d++;
     }else{
         $b++;
     }
}
if($a > 0 && $b > 0){
    echo "Yes";
}elseif($n == 1 && $c == $x){
    echo "Yes";
}else{
    echo "No";
}

?>