#include <bits/stdc++.h>
using namespace std;
const long long OO = 1e8;
const double EPS = (1e-7);
int dcmp(double x, double y) { return fabs(x - y) <= EPS ? 0 : x < y ? -1 : 1; }
int main() {
  double l, p, q;
  cin >> l >> p >> q;
  cout << (l * p) / (p + q) << endl;
  return 0;
}
