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

void solve() {
  double a, b, c;
  cin >> a >> b >> c;
  cout << (a * c / b) << endl;
}

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(10);
  solve();
  getchar();
}