# include <stdio.h>
# include <math.h>
# include <stdlib.h>

void main()
{
    double vs,r,c,vr,w;
    int n;
    scanf("%lf%lf%lf%d",&vs,&r,&c,&n);
    while(n--)
        {
            scanf("%lf",&w);
            vr = vs/sqrt(r*r+1/(w*w*c*c))*r;
            printf("%.3lf\n",vr);
        }    
}