S=input()
result=[]
N=len(S)
for i in range(N):
  if int(S[i])!=3:
    result.append(int(S[i]))
  else:
    result.append(2)
    for j in range(i+1,N):
      result.append(9)
    break
if sum(result)%3!=0:
  print(*result,sep='')
  exit()
for i in range(len(result)-1,-1,-1):
  if result[i]>0:
    result[i]-=1
    if result[i]==3:
      result[i]=2
    for j in range(i+1,len(result)):
      result[j]=9
    print(*result,sep='')
    exit()