# -*- coding: utf-8 -*-
def f(X,Y,i):
    n=0
    q,r=divmod(X,i)
    while r==0:
        n+=1
        X=q
        q,r=divmod(X,i)
    if n%2==0:
        return (X,Y)
    else:
        return (X,Y*i)

X,Y=f(int(input()), 1, 2)
X,Y=f(X, Y, 3)

i=5
while i**2<=X:
    if i%3!=0:
        X,Y=f(X,Y,i)
    i+=2
print(Y*X)