def is_nabeatsu(N: str) -> bool:
    digitsum = sum(int(c) for c in N)
    return digitsum % 3 == 0 or '3' in N
    
N = input()
N = list(N)
while is_nabeatsu(''.join(N)):
	try:
		i = N.index('3')
		N[i] = '2'
		for j in range(i + 1, len(N)):
			N[j] = '9'
	except ValueError:
		i = len(N) - 1
		while True:
			if N[i] == '0':
				N[i] = '9'
				i -= 1
			else:
				N[i] = str(int(N[i]) - 1)
				break
print(''.join(N))