Return the amount of alcohol (in gramm) for a person with the given
     body stats and blood alcohol content (per mill)

def promille_to_gramm(bac, age, weight, height, sex):
  """Return the amount of alcohol (in gramm) for a person with the given
     body stats and blood alcohol content (per mill)
  """
  bw = calculate_bw(age, weight, height, sex)
  return (bac * (PB * bw)) / W