Tf, Vf, Hf, Td, Vd, Hd = map(int, input().split())

if Vd > Vf:
  Tc = (Vf*Tf - Vd*Td) / (Vf - Vd)
  
  Tc0 = Tf + (2*(Hf-Hd))**(0.5)
  #print("Tc")
  #print(Tc)
  #print("Can catch:")
  #print(Tc0)

  if Tc <= Tc0:
    Tr = Tc0 + Vf*(Tc0- Tf)/Vd
  else:
    Tc2 = Tf + (2*Hf)**0.5
    if Tc >= Tc2:
      #print("on the floor")
      #print(Tc2)
      Tr = Td + 2 * Vf*(Tc2 - Tf) / Vd
    else:
      #print("middle")
      Tr = Tc + Vf * (Tc - Tf) / Vd
else:
  Tc2 = Tf + (2*Hf)**0.5
  #print(Tc2)
  Tr = Td + 2 * Tc2 * Vf / Vd
  
#print("%.8f" % Tr)