n=int(input())
i=2
table=[]
while i*i<=n:
    while n%i==0:
        n//=i
        table.append(i)
    i+=1
if 1<n:
    table.append(n)
s=set(table)
ans=1
for i in s:
    w=table.count(i)
    if w%2!=0:
        ans*=i
print(ans)