CodeForces 591A Wizards' Duel

水题

#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
using namespace std;


int main()
{
    double l,a,b;
    while(~scanf("%lf%lf%lf",&l,&a,&b))
    {
        printf("%.4lf\n",l/(a+b)*a);
    }
    return 0;
}