import math
def p_decom(n):
  ret = []
  while n % 2 == 0:
    ret.append(2)
    n /= 2
  for i in range(2, int(math.sqrt(n))+1):
    while n % i == 0:
      ret.append(i)
      n /= i
  if n > 1:
    ret.append(n)
  return ret

a = p_decom(input())
se = set(a)
b = list(se)
ans = 1
for i in range(len(b)):
    ans *= b[i] if a.count(b[i])%2==1 else 1
print ans