#| BEGIN (Введите свое решение) |#

(define (cube x) (* x x x))

(define (improve guess x)
  (/ (calc x guess) 3)
)

(define (calc x y)
  (+ (/ x (* y y)) (* 2 y))
)

(define (good-enough? guess x)
  (< (abs (- (cube guess) x)) 0.00001)
)

(define (cube-root-iter guess x)
  (if (good-enough? guess x)
      guess
      (cube-root-iter(improve guess x) x)
  )
)

(define (cube-root x)
  (cube-root-iter 1.0 x)
)
#| END |#