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

	LL Tf, Vf, Hf, Td, Vd, Hd;
LD maxi;
bool check(LD val)
{
	LD valF= min(maxi,val + (Td - Tf));

	LD hF = Hf - (valF*valF/2);
	LD hD = val*val*3/2;
	if(hD > Hd)
		hD = Hd;

	LD posD = val*Vd;
	LD posF = valF * Vf;


	//cout<<hF<<' '<<hD<<' '<<posF<<' '<<posD<<endl;

	return posD >= posF && hD >= hF;

}

int main()
{
	cout<<fixed<<setprecision(9);


	cin>>Tf>>Vf>>Hf>>Td>>Vd>>Hd;

	LD l = 0, p = 1e14;
	maxi = sqrt(2 * Hf);


	while(p-l > 1e-6)
	{
		LD mid = (l+p)/2;
		if(check(mid))
			p = mid;
		else l = mid;

	}
	
	LD res =  Td + l;
	if(l + Td - Tf <= maxi)res += (Td - Tf +l)*Vf/Vd;
	else res += maxi * Vf / Vd;

	cout<<res;
}