#include <bits/stdc++.h>
using namespace std;
int main(int argc, char** argv) {
  double l, p, q;
  double t, col1p, col1q;
  scanf("%lf %lf %lf", &l, &p, &q);
  t = l / (p + q);
  col1p = t * p;
  col1q = t * q;
  t = (l + col1p + col1q) / (p + q);
  printf("%lf\n", p * (t - col1p / p));
  return 0;
}
