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: Wrong Answer)

#include<stdio.h>
int main(void){
    int a,i,ans;
    int value[i],cost[i];
    scanf("%d",&a);
    for(i=0;i<a;i++){
    scanf("%d",&value[i]);
    }
    for(i=0;i<a;i++){
    scanf("%d",&cost[i]);
    }
    ans = 0;
    int c;
    for(i=0;i<a;i++){
          c = value[i] - cost[i];
       if(c>0) {
            ans += c;
          }
    }
 printf("%d",ans);
 return 0;
}