(define (System.out.println x)
  (begin
    (display x)
    (newline)
  )
)

(let (
      (p (read))
      (q (read))
     )
  (let (
        (p1 (* (- 1 p) q))
        (p2 (* p (- 1 q) q))
       )
    (if (< p1 p2)
        (System.out.println "YES")
        (System.out.println "NO")
    )
  )
)