#include <bits/stdc++.h> 
using namespace std;
#include <ios>
#include <iomanip>
  
int main() {
  double a, b, c;
  cin >>a>>b>>c;
  double Acity = b/(b+c)*a;
  double Bcity = c/(b+c)*a;
  cout << Acity*b+Bcity*c;
}