#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
const int INF = 1 << 29;
int main() {
  double l, p, q;
  cin >> l >> p >> q;
  double t = l * 1.00 / (p + q);
  t = t * p;
  printf("%.6lf\n", t);
  return 0;
}
