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

gs = set([])
ga = 0
def p(s, ss):
    global ga
    if s == '':
        a = int(ss)
        gs.add(a)
        ga = a
    for i in set(s):
        p(s.replace(i, '', 1), ss+i)

def main():
    l = input()
    if len(set(l)) == 1:
        print(1)
        return
    
    s = set([])
    p(l,'')
    a = f(ga)
    for i in gs:
        a = g(a, i)
    ans = 1
    for i in a:
        ans *= i
    print(ans)

if __name__ == '__main__':
    main()