#include<bits/stdc++.h>

#define REP(i, n) for(int i =0; i < n; ++i)

using namespace std;

long double tf,t_dog,v_fris_x,v_dog_x,h_fris,h_dog,
	v_dog_y,
	t_dog_hd,
	t_fris_hd,
	t_chyt_x,
	t_pad,
	t_dobehne,
	t_chyt_y;
bool spadne;

long double yd(long double t){
	if(t <= t_dog) return 0;
	if(t >= t_dog_hd) return h_dog;
	return (t-t_dog)*v_dog_y - 1.5*(t-t_dog);
}

long double xd(long double t){
	if(t <= t_dog) return 0;
	return v_dog_x*(t-t_dog);
}

long double yf(long double t){
	if(t <= t_pad) return h_fris - 0.5*t*t;
	return 0;
}

long double xf(long double t){
	if(t <= t_pad) return v_fris_x*t;
	return v_fris_x*t_pad;
}

int main(){
	long double res;

	cin >> tf >>v_fris_x>>h_fris>>t_dog>>v_dog_x>>h_dog;
	t_dog-=tf;

	t_pad = sqrt(2*h_fris);
	if(h_fris>=h_dog) t_fris_hd = sqrt(h_fris-h_dog);
	else t_fris_hd=0;

	long double t_mx = sqrt(2*h_dog/3);
	v_dog_y = 3*t_mx;
	t_dog_hd = t_mx + t_dog;
	t_chyt_x = (v_fris_x*t_dog)/(v_dog_x-v_fris_x)+t_dog;

	if(t_chyt_x < t_dog)
		spadne=true;

	t_dobehne = (v_fris_x*t_pad + v_dog_x*t_dog)/v_dog_x;

	/*double discr = (v_dog_y + 3*t_dog)*(v_dog_y+3*t_dog) - 4*(h_fris + v_dog_y*t_dog + 3*t_dog*t_dog/2);

	if(discr >= 0) t_chyt_y = 0.5*(v_dog_y + 3*t_dog - sqrt(discr));
	
	if(spadne){
		res = 2*t_dobehne - t_dog;
	} else{
		double t;
		if(t_dog_hd <= t_fris_hd){
			t = max(t_chyt_x, t_fris_hd);
		} else{
			t = max(t_chyt_x, t_chyt_y);
		}
		double s = v_fris_x*t;
		res = 2*s/v_dog_x + t_dog;
	}*/

	long double tmin = t_dog, tmax = 4*xf(t_pad)/v_dog_x + t_dog;

	while(tmax-tmin > 0.0000001){
		long double tm = (tmax+tmin)/2;
		if(yd(tm) >= yf(tm) && xd(tm) >= xf(tm)) tmax = tm;
		else tmin = tm;
	}


	cout << setprecision(9) << (tf+tmin+xf(tmin)/v_dog_x) << endl;

	return 0;
}