# coding: utf-8
import math
X=input()
N=X
prime = 1
ans = 1
for i in range(2,int(math.sqrt(X))+2):
	if(N%i==0):
		prime = 0
		count = 0
		while(N%i==0):
			N/=i
			count+=1
		if count%2==1: ans*=i

if prime == 1: print X
else: print ans