X = input()
a = [0] * 1000010
i = 2
while i < 1000010:
    if X % i == 0:
        X /= i
        a[i] += 1
    else:
        i += 1
ans = 1
for i in xrange(len(a)):
    if a[i] % 2 == 1:
        ans *= i
print(ans)