import sys
x=input()
a=[]
t=x
while t%2==0:
	t/=2
	a+=[2]
for i in xrange(3,int(x**0.5)+2,2):
	while t%i==0 and t>1:
		t/=i
		a+=[i]
	if t<2:
		break
a+=[t]
#print a,len(a)
x=1
for i in set([i for i in a if a.count(i)&1==1]):
	x*=i
print x