#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  double a, b, c;
  cin >> a >> b >> c;
  cout << setprecision(20) << fixed << a / b * c << '\n';
  return 0;
}