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

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