#include <bits/stdc++.h>
using namespace std;
template <class T>
T max(T a, T b, T c) {
  return ((a > b) ? ((a > c) ? a : c) : ((b > c) ? b : c));
}
template <class T>
T min(T a, T b, T c) {
  return ((a < b) ? ((a < c) ? a : c) : ((b < c) ? b : c));
}
const int mod = 1000000000 + 7;
const int maxn = 100000 + 9;
int main(void) {
  int t = 1;
  while (t--) {
    double l, p, q;
    cin >> l >> p >> q;
    printf("%lf\n", (p * l) / (p + q));
  }
  return 0;
}
