#include<iostream>

#include<cmath>

#include<iomanip>

using namespace std;

int main()

{

    //freopen("acm.acm","r",stdin);

    double vs;

    double r;

    double c;

    double w;

    int n;

    cin>>vs>>r>>c>>n;

    while(n --)

    {

        cin>>w;

        cout<<setiosflags(ios::fixed)<<setprecision()<<c*w*vs*sqrt(1.0/(w*w+))<<endl;

    }

}