from math import gcd
from collections import Counter
def gcds(ls):
  ret = 0
  for i in ls:
    ret = gcd(ret,i)
  return ret
n = input()
c = Counter(n)
d = list(int(i) for i in c.keys())
ans = 1
if len(d) == 1:
  ans = n
else:
  if len(d) == 2 and 0 in d:
    ans *= c[1]
  elif gcds(d) != 1:
    b = gcds(d)
    if b%3:
      ans *= b
    else:
      ans *= b//3
  dsum = 0
  for i,j in c.items():
    dsum += int(i)*j
  if dsum%9 == 0:
    ans *= 9
  elif dsum%3 == 0:
    ans *= 3
print(ans)