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 PHP7 (7.0.15) (judge verdict: Accepted)

<?php
$arr = explode(' ', fgets(STDIN));

$startTime = (int) $arr[0];
$biscuitCount = (int) $arr[1];
$endTime = ((int)$arr[2]) + 0.5;

if ($endTime < $startTime) {
    echo 0 . PHP_EOL;
    exit;
}

$diff = floor($endTime / $startTime);
echo $diff * $biscuitCount . PHP_EOL;