from collections import defaultdict

x = int(input())

d = defaultdict(int)
while x % 2 == 0:
    x //= 2
    d[2] += 1
f = 3
while f * f <= x:
    while x % f == 0:
        x //= f
        d[f] += 1
    f += 2
if x != 1:
    d[x] += 1
ans = 1
for val, cnt in d.items():
    if cnt % 2 == 1:
        ans *= val
print(ans)