def cycle(digits, position):
	if isinstance(digits, int):
		digits = list(map(int, str(digits)))
	if not digits:
		return position
	if position == "Off":
		return cycle(digits[1:], "Blue")
	elif position == "Blue":
		if digits[0] == 2:
			return cycle(digits[1:], "Blue")
		else:
			return cycle(digits[1:], "Red")
	elif position == "Red":
		if digits[0] == 2:
			return cycle(digits[1:], "Red")
		else:
			return cycle(digits[1:], "Off")
 
integer = 1
 
while True:
	integer += 1
	if not (set(str(integer)) - {"1", "2"}):
		if [cycle(integer, "Off"), cycle(integer, "Blue"), cycle(integer, "Red")] == ["Off"] * 3:
			print(integer)
			break

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