import collections,sys,math,functools,operator,itertools,bisect,heapq,decimal,string,time,random
input = sys.stdin.readline
sys.set_int_max_str_digits(0)
s = list(map(int,list(input().rstrip())))
y = sum(s)
x = int(''.join(list(map(str,s))))
if y % 3 == 0:
    x -= 1
s = list(map(int,list(str(x))))

for i in range(len(s)):
    if s[i] == 3:
        s[i] = 2
        for j in range(i+1,len(s)):
            s[j] = 9
        break
y = sum(s)
x = int(''.join(list(map(str,s))))
if y % 3 == 0:
    x -= 1
print(x)