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 C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#include <stdlib.h>
 
int main(void){
  int a,b,t;
  int sum=0;
  scanf("%d", &a);
  scanf("%d", &b);
  scanf("%d", &t);
  
  for(;a>20||a<1||b>20||b<0||t>20||t<0;){
  	printf("入力は1~20の範囲でおこなってください．\n");
  	scanf("%d", &a);
    scanf("%d", &b);
    scanf("%d", &t);
  }
  
  for(int i=0; i < t/a; i++){
    sum += b;
  }
  printf("%d\n", sum);
 
}