Problem:
Score : 100 points

Problem Statement

A biscuit making machine produces B biscuits at the following moments: A seconds, 2A seconds, 3A seconds and each subsequent multiple of A seconds after activation.

Find the total number of biscuits produced within T + 0.5 seconds after activation.

Constraints

All values in input are integers.

1 \leq A, B, T \leq 20

Input

Input is given from Standard Input in the following format:

A B T

Output

Print the total number of biscuits produced within T + 0.5 seconds after activation.

Sample Input 1

3 5 7

Sample Output 1

10

Five biscuits will be produced three seconds after activation.

Another five biscuits will be produced six seconds after activation.

Thus, a total of ten biscuits will be produced within 7.5 seconds after activation.

Sample Input 2

3 2 9

Sample Output 2

6

Sample Input 3

20 20 19

Sample Output 3

0

Solution in Common Lisp (SBCL 1.1.14) (judge verdict: Accepted)


(defmacro aif(test then else)
  `(let ((it ,test))
     (if it ,then ,else)))

(defun split (pattern str)
  (aif (search pattern str)
       (cons (subseq str 0 it) (split pattern (subseq str (+ it (length pattern)))))
       (list str)))

(defun main ()
  (let* ((input (split " " (read-line)))
         (a (parse-integer (first input)))
         (b (parse-integer (second input)))
         (tt (parse-integer (third input))))
    (print (* (floor tt a) b))))
(main)