N = list(input())

# 10^6
if '3' in N:
  idx = N.index('3')
  N[idx:] = ['9'] * (len(N) - idx)
  N[idx] = '2'

sum_digits = sum(map(int, N))
number = int(''.join(N))

while (sum_digits % 3 == 0 or number % 10 == 3):
  number -= 1
  sum_digits -= 1

print(number)