#include <bits/stdc++.h>
using namespace std;
int main() {
  bool f = 0;
  double l, p, q, t, t1, t2, t3, t4, ans;
  cin >> l >> p >> q;
  t = l / (p + q);
  ans = p * t;
  cout.precision(12);
  cout << ans;
  return 0;
}
