(plan 1)

(defun range (start end)
  (do ((lst (list) (cons i lst)) (i start (+ 1 i))) ((= i end) lst)))

(let ((result (reduce + (filter (lambda (x) (or (zerop (mod x 3)) (zerop (mod x 5)))) (range 1 1000)))))
  (expect "euler1 - result is 233168" (= result 233168)))