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

#define int long long

const double EPS = 1e-8;

signed main()
{
	int X;
	cin >> X;
	int Y = 1, s = sqrt(X) + EPS;
	if (X == 1) Y = 4;
	for (int i = 2; i <= s && X > 1; i++)
	{
		int cnt = 0;
		while (X%i == 0 && X > 1) X /= i, cnt++;
		if (cnt&1) Y *= i;
	}
	printf("%lld\n", Y);
	return 0;
}