from collections import defaultdict

L = [1 for i in range(100001)]
L[0] = 0
L[1] = 0
plist = []
for i in range(100001):
	if L[i] == 1:
		plist.append(i)
		c = 2
		while True:
			if i * c <= 100000:
				L[i * c] = 0
				c += 1
			else:
				break

X = int(input())
D = defaultdict(int)

x = X
judge = "YES"
while judge == "YES":
	for i in plist:
		if x < i:
			judge = "NO"
		else:
			if x % i == 0:
				D[i] += 1
				x = int(x // i)
				break


ans = 1
for i in D:
	if D[i] % 2 == 1:
		ans *= i

print(ans)