import sys, time, random, heapq, math, itertools
from collections import deque, Counter, defaultdict
#from sortedcontainers import SortedSet, SortedList
from bisect import bisect, bisect_left, bisect_right
import heapq as hq
from functools import cache, cmp_to_key
def debug(*x):print('debug:',*x, file=sys.stderr)
sys.setrecursionlimit(300000)
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 61 - 1
mod = 998244353

N = list(input())

for i in range(len(N)):
    if N[i] == "3":
        N[i] = "2"
        for j in range(i+1,len(N)):
            N[j] = "9"
        break
cnt = 0
for i in range(len(N)):
    cnt += int(N[i])
    cnt %=3
if cnt % 3 == 0:
    print(int("".join(N)) - 1)
else:
    print(int("".join(N)))