n = input()
f = 0
ans = []
now = 0
for a in n[:-1]:
	if f:
		ans.append("9")
	else:
		if a == "3":
			f = 1
			ans.append("2")
			now += 2
		else:
			ans.append(a)
			now += int(a)
	now %= 3

if f:
	t = 9
	while (t + now) % 3 == 0:
		t -= 1
	ans.append(str(t))
else:
	if n[-1] != "0":
		t = int(n[-1])
		while not (t + now) % 3 or t == 3:
			t -= 1
		ans.append(str(t))
	else:
		if now:
			ans.append("0")
		else:
			cnt = 1
			while ans[-1] == "0":
				cnt += 1
				ans.pop()
			if ans[-1] == "4":
				ans.pop()
				ans.append("2")
				for _ in range(cnt):
					ans.append("9")
			else:
				t = int(ans.pop())
				ans.append(str(t-1))
				for _ in range(cnt):
					ans.append("9")

print("".join(ans))