def pfact(m):
	pf = {}
	for i in range(2,int(m**0.5)+1):
		while m%i == 0:
			pf[i] = pf.get(i,0) + 1
			m //= i
	if m>1 : pf[m]=1
	return pf


x = int(input())
j = pfact(x)

ans = 1
for i, r in j.items():
	if r % 2 == 1:
		ans *= i

print(ans)