new_contents: def checkio(B00):
      BO0, B0O, BOO = 1, 1, 0
      while B00 != 10000:
          BOO += 1
          if BOO == B0O:
              B00 += B0O
              BO0, B0O = B0O, BO0+B0O
          else:
              B00 -= 1
      return BOO
  
subject: Create ghosts-age.py