answer = "Unknown"

if not (isKnown answer) and isKnown p1
  answer = p1
if not (isKnown answer) and isKnown p2
  answer = p2
if not (isKnown answer) and isKnown p3
  answer = 100 - p3

if not (isKnown answer)
  if (isKnown female) and (isKnown male)
    answer = 100 * (female / (female + male))
  else
    answer = "Unknown"

answer