# -*- coding: utf-8 -*-

X = int(input())

# Xを素因数分解する
primes = {}
i = 2
while i*i<=X:
    while X>=i and X%i==0:
        X //= i
        if i in primes:
            primes[i] += 1
        else:
            primes[i] = 1
    i += 1

Y = 1
if len(primes) == 0:
    Y = X
else:
    for key in primes:
        if primes[key]%2 == 1:
            Y *= key
    Y *= X

print(Y)