# your code goes here
#square
X=int(input())
N=0
N=X
i=2
a=[]
c=[]
while i*i<=N:
    if N%i==0:
        a.append(i)
        N//=i
        b=1
        while N%i==0:
            N//=i
            b+=1
        c.append(b)
    i+=1
if a==[]:
    a=[X]
    c=[1]
else:
    a.append(N)
    c.append(1)
S=1
for i in range(len(a)):
    if c[i]%2==1:
        S*=a[i]
print(S)