n = input()
if len(set(n)) == 1:
    print(n)
    exit()
tot = sum(map(int, n))
if tot % 9 == 0:
    ans = 9
elif tot % 3 == 0:
    ans = 3
else:
    ans = 1
if all(int(x) % 4 == 0 for x in n):
    ans *= 4
elif all(int(x) % 2 == 0 for x in n):
    ans *= 2
if all(int(x) % 5 == 0 for x in n):
    ans *= 5
print(ans)