import pickle


def dst(x):
  i = 1
  while i < x:
    i *= 2
  return i == x




f = open("input.dat", "rb")
f1 = open("output.dat", "wb")
fl = 0
while True:
  try:
    x = pickle.load(f)
    if (x in f) > 2 and dst(x):
      pickle.dump(x, f1)
      fl = 1
  except EOFError:
    break
f.close()
if not fl:
  pickle.dump(0, f1)
f1.close()