s = input()

n = len(s)
for i in range(1, 10):
    if s == str(i) * n:
        print(s)
        exit()

C = [0 for _ in range(10)]
for i in range(n):
    C[int(s[i])] += 1

sum_ = 0
for i in range(10):
    sum_ += i * C[i]

ans = 1
if sum(C[0::9]) == n or sum_ % 9 == 0:
    ans *= 9
elif sum(C[0::3]) == n or sum_ % 3 == 0:
    ans *= 3
    if sum(C[0::6]) == n:
        ans *= 2
if sum(C[0::8]) == n:
    ans *= 8
elif sum(C[0::4]) == n:
    ans *= 4
elif sum(C[0::2]) == n and ans % 6 != 0:
    ans *= 2
    if sum(C[0::6]) == n:
        ans *= 3
if sum(C[0::7]) == n:
    ans *= 7
if sum(C[0::5]) == n:
    ans *= 5
print(ans)