#include <bits/stdc++.h>
using namespace std;
#define LL long long
#define LD long double

LD timeVer(LL Tf, LL Vf, LL Td, LL Vd)
{
	LL timeDiff = Td - Tf;
	LD gain = timeDiff * Vd;
	return gain /(Vd - Vf);
}

LD timeHor(LL Hf, LL Hd, LL timeDiff)
{
	LD timeDog = sqrt(2*Hd/3.0);
	LD timeFris = sqrt(2*(Hd - Hf));

	LD delta = (16*Hd - 12*timeDiff*timeDiff);
	if(delta > 0){
	//cout<<16*Hd - 12*timeDiff*timeDiff<<endl;
	LD mid = (6 * timeDiff - sqrt(delta))/8.0;
	if(mid < timeDiff)
		mid += sqrt(delta)/4;

	if(mid < timeDog)
		return max(timeFris, mid);
	else
		return timeFris;
	}
	else return max(timeFris, timeDog);
}
int main()
{
	cout<<fixed<<setprecision(9);


	LL Tf, Vf, Hf, Td, Vd, Hd;


	cin>>Tf>>Vf>>Hf>>Td>>Vd>>Hd;
	LL deltaTime = Td - Tf;
	LD landTime = sqrt(2*Hf);	

	if(landTime <= deltaTime)
	{
		cout<<Td + landTime * Vf *2/Vd;
		return 0;
	}		

	LD time = max(timeHor(Hf,Hd,deltaTime), timeVer(Tf,Vf,Td,Vd));

	LD res =  Td + time + (time + deltaTime) *Vd/Vf;
	cout<<res;
}