# include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll x, cnt, s, y;

int main()
{
	scanf("%lld", &x);
	s = sqrt(x);
	y = 1;
	for (ll i = 2; i <= s; i++)
	{
		cnt = 0;
		while (x % i == 0) cnt++, x /= i;
		if (cnt & 1) y *= i;
	}
	if (x > 1) y *= x;
	printf("%lld\n", y);
	return 0;
}