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

for ($i = 0; $i < $n; $i++) {
     $c[$i] = ($l+$a[$i])/2;
     $c[$i] = $l;
     if (floor($c[$i]) == $m) {
         echo "Yes"."\n";
         break;
     }elseif (floor($c[$i]) > $m) {
         echo "No"."\n";
         break;
     }
     
}
?>