from collections import Counter
x = int(raw_input())
l = []
while x % 2 == 0:
    l.append(2)
    x /= 2
d = 3
while x != 1:
    if x % d == 0:
        l.append(d)
        x /= d
    else:
        d += 2
c = Counter(l)
a = 1
for k,v in c.items():
    if v % 2 == 1:
        a *= k
print a