n=input()
l=len(n)
s=[*map(int,n)]
for i in range(l):
  if s[i]==3:
    s[i]=2
    s[i+1:]=[9]*(l-i-1)
    break
t=sum(s)
if t%3:
  exit(print(*s,sep=''))
for _ in range(2):
  s[-1]-=1
  for i in range(1,l)[::-1]:
    if s[i]<0:
      s[i]=9
      s[i-1]-=1
  for i in range(l):
    if s[i]==3:
      s[i]=2
      s[i+1:]=[9]*(l-i-1)
      break
  t=sum(s)
  if 3 not in s and t%3:
    exit(print(*s,sep=''))