#include<iostream>
#include<cstdio>
#include<cctype>
#include<string.h>
#include<math.h>
#include<cmath>
#include<algorithm>
#include<iomanip>
using namespace std;
int main()
{
	int n,x;
	double m;
	cin>>n>>m>>x;
	m=m/n*x;
	printf("%.2lf",m); 
	return 0;
}