(defparameter temp (read-from-string (concatenate 'string "(" (read-line) ")")))
(defparameter H (nth 0 temp))
(defparameter W (nth 1 temp))
(defparameter N (nth 2 temp))
(defparameter K (nth 3 temp))

(defparameter amari (mod (* H W) N))
(if (= amari 0) (setq amari N))
(format t (if (= amari K) "YES~%" "NO~%"))