#! /usr/bin/env python3

import itertools

def f(n):
    l = []
    a, b = 0, 2
    while b * b <= n:
        if n % b == 0:
            n //= b
            l += [b]
        else:
            b += 1 + a
            a = 1
    if n > 1 : l += [n]
    return [1] + l

def g(a, b):
    r = []
    for i in a:
        if b % i == 0:
            r += [i]
            b //= i
    return r
    

def main():
    l = input()
    s = set([])
    for i in itertools.permutations(l, len(l)):
        s.add(int(''.join(i)))
    a = f(sorted(s)[0])
    for i in s:
        a = g(a, i)
    ans = 1
    for i in a:
        ans *= i
    print(ans)

if __name__ == '__main__':
    main()