#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a; i<b; i++)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define debug printf

typedef long long ll;
typedef pair<int, int> pii;
typedef long double ld;

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

ld t1, t2, t3;

bool prob(ld h)
{
	//cout << h << endl;
	ld t = sqrtl(2.0 * (Hf - h));
	ld tx = fabsl((-sqrtl(6.0 * Hd) + sqrtl(6.0*(Hd-h))) / 3.0);
	ld xf = Vf * t;
	t1 = xf / Vd + Td;
	t2 = tx + Td;
	t3 = t + Tf;
	//cout << t1 << " " << t2 << " " << t3 << endl;
	return max(t1, t2) < t3;
}

int main()
{
	ios_base::sync_with_stdio(0);
	cin >> Tf >> Vf >> Hf >> Td >> Vd >> Hd;
	
	cout << fixed << setprecision(10);
	if(prob(0.0) == 0)
	{
		cout << (2.0 * t1 - Td) << "\n";
		return 0;
	}
	if(prob(Hd) == 1)
	{
		cout << (t3 + t1 - Td) << "\n";
		return 0;
	}
	
	ll dokl = 1000000000000000LL;
	
	ll l = 0, r = dokl;
	while(l + 1 < r)
	{
		ll mid = (l + r) / 2;
		ld h = ((ld)mid / dokl) * Hd;
		bool czy = prob(h);
		if(czy)
			l = mid + 1;
		else
			r = mid;
	}
	ld h = ((ld)l / dokl) * Hd;
	//cout << l << " " << h << endl;
	prob(h);
	cout << (max(t1, t2) + t1 - Td) << endl;
	return 0;
}