#include <iostream>
#include <cmath>
#define lli long long int
#define ld long double
using namespace std;

int main() {
	int tf, vf,hf, td, vd, hd;
	cin >> tf >> vf >> hf >> td >> vd >> hd;
	ld t1, t2;
	t1 = +tf + sqrt( tf*tf + 2 * (hf-tf*tf/2));
	t2 = +tf - sqrt( tf*tf + 2 * (hf-tf*tf/2));
	ld tdistance = (vf*tf-vd*td)/(vf-vd);
	ld th1, th2;
	th1 = +tf + sqrt( tf*tf + 2 * (hf-tf*tf/2 -hd));
	th2 = tf - sqrt( tf*tf + 2 * (hf-tf*tf/2 -hd));
	//cout << "t1 " << t1 << " t2 " << t2 << endl;
	//cout << "th1 " << th1 << " th2 " << th2 << endl;
	ld tdopad, theight;
	tdopad = t1 > t2 ? t1 : t2;
	theight = th1 > th2 ? th1 : th2;
	//ld result;
	if (tdistance > tdopad && tdistance < theight) {
		cout << theight*vf + theight*vf/vd << endl;
	} else if (tdistance > tdopad) {
		cout << (  2* (  (vf*tdopad+vd*td) /vd) ) << endl;
	} else {
		cout << 2*tdistance << endl;
	}
	return 0;
}