# -*- coding: utf-8 -*-
X = int(input())

P = []

i = 2
while i * i <= X:
    cnt = 0
    while X % i == 0:
        X /= i
        cnt += 1
    if cnt % 2:
        P.append(i)
    i += 1

P.append(X)
    
ret = 1
for i in xrange(len(P)):
    ret *= P[i]

print ret