#include <bits/stdc++.h>
#include <iostream>
#include <string>
#include <vector>

using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
typedef long long ll;

int main(){
  int a,b,c;
  cin >> a >> b >> c;
  double w = (double)a/(double)b;
  double ans = w*c;
  cout << fixed << setprecision(10) << ans << endl;
}