from collections import defaultdict
n=int(input())
def prime_list(x):
	i=2
	prime=defaultdict(int)
	while i*i<=x:
		while x%i==0:
			x//=i
			prime[i]+=1
		i+=1
	if x>1:
		prime[x]+=1
	return prime

p=prime_list(n)
ans=1
for x in p:
	if p[x]%2==1:
		ans*=x
print(ans)