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 Go (1.6) (judge verdict: Time Limit Exceeded)

package main

import (
	"fmt"
	"time"
)

func main() {
	var a, b, t int64
	fmt.Scanf("%d %d %d", &a, &b, &t)
	limit := time.Duration(t)*time.Second + 500*time.Millisecond
	var i int64 = 1
	var biscuits int64
	for begin := time.Now(); time.Since(begin) < limit; {
		time.Sleep(time.Duration(i*a) * time.Second)
		biscuits += b
		i += 1
	}
	fmt.Printf("%d\n", biscuits)
}