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 Ruby (2.3.3) (judge verdict: Runtime Error)

inputs = Array.new
while line = $stdin.gets
  inputs << line.chomp
end

N = inputs[0]
Vs = inputs[1].split(" ").map(&:to_i)
Cs = inputs[2].split(" ").map(&:to_i)

res = [Vs, Cs].transpose.sum do |v, c|
  val = v - c
  if val > 0
    val
  else
    0
  end
end

puts res