(defparameter a (parse-integer (read-line)))
(defparameter b (parse-integer (read-line)))
(defparameter c (parse-integer (read-line)))

;(print (ceiling (/ a b)))
;(print (ceiling (/ a c)))
;(print (ceiling (* (ceiling (/ a b)) 2/3)))
;(print (ceiling (/ a c)))
(format t (if (>= (* (ceiling (/ a b)) 2/3) (ceiling (/ a c)))  "YES~%" "NO~%"))