A rough pipe of 0.5 m diameter, 300 m length and roughness height of 0.25 mm, carries water (kinematic viscosity  with velocity of 3 m/s. Friction factor  for laminar flow is given by  and for turbulent flow it is given by where, Reynolds number,  radius of pipe,  roughness height and  The head loss (in m, up to three decimal places) in the pipe due to friction is ________.