#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define ull unsigned long long

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


int main() {
	double Tf, Vf, Hf, Td, Vd, Hd;
	cin >> Tf >> Vf >> Hf >> Td >> Vd >> Hd;
	double t1 = Tf + sqrt(2*(Hf-Hd));
	double t2 = Td + (((Tf-Td)*Vf) / (Vf - Vd));
	
	if(Vf == Vd && Tf == Td) {
		t2 = 0;
	}
	
	double t3 = Tf + sqrt(2*Hf);
	
	//cout << "t3: " << t3 << endl;
	
	double Td_up = sqrt((2.0/3)*Hd);
	double Vd_up = Hd/Td_up;
	
	double b = Tf-Vd_up-3*Td;
	double c = Hf-(1/2)*Tf*Tf+Vd_up*Td+(3.0/2)*Td*Td;
	
	double tm = (-b+sqrt(b*b-4*c))/2;
	
	//cout << "tm: " << tm << endl;
	
	double t;
	if(t1 > t2) {
		t = t1;
	} else if(t3 < t2) {
		t = t3;
	} else {
		t = t2;
	}
	
	//if(t < tm) t = tm;
	
	//cout << "t: " << t << endl;
	
	double s = ((t-Tf)*Vf);
	
	//cout << "s: " << s << endl;
	
	double t_run = t + (s/Vd);
	
	if(t == t3) {
		t_run = Td + 2*(s/Vd);
	}
	
	cout << t_run << endl;
}