cf #327 Div.2 Problem A Wizards' Duel

#include <iostream>#include <cstdio>using namespace std;int main(){    int l,p,q;    scanf("%d%d%d",&l,&p,&q);    double ans;    ans=(double)l*1.0/(p+q)*p;    printf("%lf\n",ans);    return 0;}