#include <bits/stdc++.h>
using namespace std;
void Debug(vector<int> v) {
  for (int i : v) {
    cerr << i << " ";
  }
}
void Debug(int a[]) {
  for (int i = 0; i < 5; i++) {
    cerr << a[i] << " ";
  }
}
void Debug(int a) { cerr << a; }
void Debug(string a) { cerr << a; }
void Debug(long long a) { cerr << a; }
void Debug(unsigned long long a) { cerr << a; }
void Debug(float a) { cerr << a; }
void Debug(double a) { cerr << a; }
void Debug(char a) { cerr << a; }
int32_t main() {
  int64_t l;
  cin >> l;
  int64_t a, b;
  cin >> a >> b;
  int64_t speed = a + b;
  double time = (double)l / speed;
  cout << time * a;
  return 0;
}
