(defun read-int-list ()
  (let ((line (read-line)))
    (with-input-from-string (in line)
      (loop for x = (read in nil nil)
            while x
            collect x))))

(defun main ()
  (let* ((nk (read-int-list))
         (n (first nk))
         (k (second nk))
         (a (read-int-list))
         (l (make-array (1+ n) :initial-element 0)))
    (dolist (x a)
      (incf (aref l x)))
    (loop for i from 1 to n do
      (when (>= (+ (aref l 0) (aref l i)) k)
        (format t "Yes~%")
        (return-from main)))
    (format t "No~%")))

(main)