from functools import reduce
from itertools import product
from fractions import gcd

N = int(input())
s = list(map(int, set(str(N))))

if len(s) == 1:
	print(N)
else:
	diff = [9 * abs(x - y) for x, y in product(s, s)]
	print(gcd(N, reduce(gcd, diff, 0)))