#!/usr/bin/python
from collections import defaultdict
from operator import mul

def factorize(n):
    res = defaultdict(int)
    d = 2
    while d * d <= n:
        while n % d == 0:
            res[d] += 1
            n /= d
        d += 1
    if n > 1:
        res[n] += 1
    return res

x = int(raw_input())
filtered = [k for k, v in factorize(x).items() if v & 1] or [1]
res = reduce(mul, filtered)
print res