(define (vector-update v x y i j)
  (let1 ix (+ (* i i) (* j j))
        (cond [(<= x ix y)
               (let1 vl (vector-ref v ix)
                     (cond [(or (zero? i) (zero? j)) (vector-set! v ix (+ 2 vl))]
                           [else (vector-set! v ix (+ 4 vl))]))])))

(define (solve x y)
  (let ([v (make-vector (+ y 1) 0)])
    (let loop ([i 0]
               [j 0])
      (cond [(> (* i i) y) #t]
            [(> (* j j) y) (loop (+ i 1) 0)]
            [else (vector-update v x y i j)
                  (loop i (+ j 1))]))
     (apply max (map (^i (vector-ref v i)) (iota (- y x -1) x)))))

(define (main args)
  (let* ([x (read)]
         [y (read)])
    (print (solve x y)))
  0)