#include <bits/stdc++.h>

using namespace std;

typedef long long int ll;
typedef double ld;

typedef pair<ll, ll> ii;
typedef vector<ll> vi;
typedef vector<ii> vii;

#define PB push_back
#define ff first
#define ss second
#define DEB cerr<<"DEB: "

#define FOR(prom,a,b) for(ll prom = (a); prom < (ll)(b); ++prom)
#define ROF(prom,a,b) for(ll prom = (a); prom >= b; --prom)
#define F(a) FOR(i,0,a)
#define FF(a) FOR(j,0,a)

#define EPS (1e-6)
#define EQ(a,b) (fabs(a-b) <= fabs(b-a) * EPS)
#define LINF (1LL<<62LL)
ld Tf, Vf, Hf, Td, Vd, Hd;
ld Gf = 1, Gd = 3;

ld comp() {
	// Td
	ld vf = Gf*(Td-Tf);
	ld hf = Hf - 0.5*Gf*(Td-Tf)*(Td-Tf);
	

	ld a = 1;
	ld b = -(vf + sqrt(2.*Hd*Gd));
//	ld c =-( Hf - 0.5*Gf*Tf*Tf + 0.5*Gd*Td*Td + Td*sqrt(2.*Hd*Gd));
	ld c = hf;
/*	DEB << -b << endl;
	DEB << 2*a << endl;
	DEB<< "comp = " << b*b-4*a*c << endl;
*/	return (-b-sqrt(b*b-4.*a*c))/(2.*a);
}

int main() {
	scanf(" %lf %lf %lf %lf %lf %lf", &Tf, &Vf, &Hf, &Td, &Vd, &Hd);

	ld Tfa = sqrt(2*(Hf-Hd)/Gf) + Tf;
	ld Tfb = sqrt(2*Hf/Gf) + Tf;
	ld Tdc = sqrt(2*Hd/Gd) + Td;
	ld Tx = min((Vd*Td - Vf*Tf)/(Vd - Vf), (Tfb-Tf)*Vf/Vd + Td);
	ld Ty = comp()+Td;
	
/*	DEB << "Tfa = " << Tfa << endl;
	DEB << "Tfb = " << Tfb << endl;
	DEB << "Tdc = " << Tdc << endl;
	DEB << "Tx  = " << Tx << endl;
	DEB << "Ty  = " << Ty << endl;
*/	ld T;
	
	if (Tdc <= (Tfa + EPS) ) { // it is possible to catch it in Hd
		
		if ( Tx <= (Tfa + EPS) ) {
			T = Tfa + (Tfa-Tf)*Vf/Vd;
		} else {
			if( Tx >= (Tfb - EPS) ) {
				T = Tx + (Tfb-Tf)*Vf/Vd;
			} else {
				T = Tx + (Tx-Tf)*Vf/Vd;
			}
		}
			
	} else if (Tfb <= Tx + EPS) { // already on ground when started to jump
		ld S = (Tfb-Tf) * Vf;
		
		T = Tx + S/Vd;
	} else { // catch somewhere in between
		if ( Ty == (-5./0) ) throw("bug");
		if ( Tx <= (Ty + EPS) ) {
			T = Ty + (Ty-Tf)*Vf/Vd;
		} else {
			if( Tx >= (Tfb - EPS) ) {
				T = Tx + (Tfb-Tf)*Vf/Vd;
			} else {
				T = Tx + (Tx-Tf)*Vf/Vd;
			}
		}
	}
	printf("%.8lf\n", T);
	
	return 0;
}
/*
1 2 160 12 10 100
DEB: Tfa = 11.9545
DEB: Tfb = 18.8885
DEB: Tdc = 20.165
DEB: Tx  = 14.75
DEB: Ty  = 15.0685
17.88218363*/