随笔—邀请赛前训—Wizards' Duel

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

using namespace std;

#define  MAX(x,y) (((x)>(y)) ? (x) : (y))
#define  MIN(x,y) (((x) < (y)) ? (x) : (y))
#define ABS(x) ((x)>0?(x):-(x))

const int inf = 0x7fffffff;

int main()
{
     double n;
    cin>>n;
     double speedOfHarry,speedOfEnemy;
    cin>>speedOfHarry>>speedOfEnemy;
     double ans=n/(speedOfEnemy+speedOfHarry)*speedOfHarry;
//    ans=ans*speedOfHarry;
    printf("%0.8lf\n",ans);
//    cout<<ans<<endl;
    return 0;
}