n = list(map(int, list(input())))

def solve(n):
	for i in range(len(n)):
		if n[i] == 3:
			n[i] = 2
			for j in range(i+1, len(n)):
				n[j] = 9
	
	s = sum(n)
	if s % 3 == 0:
		j = -1
		while n[j] == 0:
			n[j] = 9
			j -= 1
		n[j] -= 1
		if n[j] == 3:
			n = solve(n)
	
	return n
	
print(*solve(n), sep='')