#include <iostream>
using namespace std;

int main()
{
	// input
	long long int x = 0;
	cin >> x;

	// solve
	for (long long i = 2; i * i <= x; i++) {
		//cout << "for: " << i << endl;
		for (int j = 0; j < x; j++) {
			if ((x % (i * i)) == 0) {
				x = x / (i * i);
			}
			else {
				break;
			}
		}
	}
	cout << x << endl;
    return 0;
}