CodeForces-591A Wizards' Duel

/************************************************
* Author        :somniloquy
* Created Time  :2015/10/25 17:10:57
************************************************/

#include <cstdio>
#include <algorithm>
#include <iostream>
#include <cstring>

using namespace std;

int main(void)
{
int l, p, q;
while(~scanf("%d", & l))
{
scanf("%d", & p);
scanf("%d", & q);
double t = l * 1.0 / (p + q);
double ans = t * p;
printf("%f\n", ans);
}
return 0;
}