// http://lx.lanqiao.cn/problem.page?gpid=T513
Scanner in = new Scanner(System.in);
long num = in.nextLong();
HashSet<Integer> set = new HashSet<>();
while (num > 1) {
int i = 2;
while (true) {
if (num % i == 0) {
set.add(i);
num /= i;
break;
}
i++;
}
}
int ret = 1;
for (int i : set) {
ret *= i;
}
System.out.println(ret);