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,b;
    double t;
    int n=1;//制御用
    int kaisu=0;
    int kos;
    scanf("%d %d %d",&a,&b,&t);
    //printf("a=%d,b=%d,t=d\n",a,b,t);
    t=t+0.5;
    //printf("t=%d\n",t);
    while(t>0){
        t=t-n*a;
        //printf("n=%d,t=%d\n",n,t);
        if(t<0)
        break;
        else
        {
            kaisu++;
            n++;
        }
        

    }
    //printf("kaisu=%d,\n",kaisu);
    kos=kaisu*b;
    printf("%d",kos);
    return 0;
}