JAG2008 ProblemA

Princess's Gamble

(defun ticket (m p votes)
  (let ((sum-of (* (/ (- 100 p) 100) (* 100 (apply #'+ votes)))))
    (if (zerop (nth (1- m) votes))
	0
	(floor (/ sum-of (nth (1- m) votes))))))

(defun main ()
  (loop
     for n = (read)
     for m = (read)
     for p = (read)
     until (and (zerop n) (zerop m) (zerop p))
     do
       (format t "~A~%" (ticket m p
			       (loop for i from 1 upto n
				      collect (read))))))