#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>
#define LP pair<ll, ll>


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

  
}