from itertools import combinations

N = raw_input()
if all(d==N[0] for d in N):
    print N
    exit()

ans = 1
S = set(N)

if len(S) == 2 and '0' in S:
    print sorted(list(S))[1]
    exit()

if all(int(d1+d2)%4==0 and int(d2+d1)%4 == 0 for d1, d2 in combinations(S, 2)):
    ans *= 4
elif all(int(d)%2==0 for d in S):
    ans *= 2

if sum(int(d) for d in N)%9 == 0:
    ans *= 9
elif sum(int(d) for d in N)%3 == 0:
    ans *= 3

print ans