#include <bits/stdc++.h>
#pragma GCC optimize("-O2")
using namespace std;
const long double PI = acos(-1);
const int MOD = 998244353, LIM = 2e5 + 5;
const long double EPS = 1e-9;
const int mod = 1000000007;
int main() {
  double l, p, q;
  std::cin >> l >> p >> q;
  double ans = l * p;
  ans /= p + q;
  std::cout << std::fixed << std::setprecision(9) << ans << '\n';
}
