x = int(input())

l = []
for i in range(2, int(x**0.5)+1):
    while x % i == 0:
        x //= i
        l.append(i)
if x > 1:
    l.append(x)

y = 1
s = set(l)
for i in s:
    z = l.count(i)
    if z % 2 != 0:
        y *= i

print(y)