#include <bits/stdc++.h>
#define pb push_back
#define FOR(i, a, b) for(int i = a; i < b; i++)
//#define FOR(i, a) FOR(i, 0, a)
#define st first
#define nd second
//#pragma GCC optimize ("Ofast")
//#pragma GCC target("sse, sse2, sse3, sse4, popcnt, abm, mmx, avx, time=native")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;

int main() {
	ios_base::sync_with_stdio(0);
	ld hf, hd, td, tf, vd, vf;
	cin >> tf >> vf >> hf >> td >> vd >> hd;
	ld t1 = sqrt(2*(hf-hd))+tf;
	ld t2 = sqrt(2*(hf))+tf;
	ld x1 = vf*(t1-tf);
	ld x2 = vf*(t2-tf);
	ld x3 = vd*(t1-td);
	ld x4 = vd*(t2-td);
	ld T = 0;
	if(x1 < x3){
		T = t1 + x1/vd;
	} else {
		if(x2 < x4){
			T = 2*((vd*td - vf*tf)/(vd-vf)-td);
		} else {
			T = x2/vd * 2 + td;
		}
	}
	cout << setprecision(6) << fixed << T;
	return 0;
}