#include <iostream>
#include <algorithm>
#include <vector>
#include <deque>
#include <string>
#include <tuple>
#include <functional>
#include <numeric>
#include <cmath>
#include <iomanip>
#include <map>
#include <random>
//#include "toollib.h"
#define INT_MAX 2147483647
#define Loop(i, n) for(int i = 0; i < (int)n; i++)
#pragma warning (disable:4018)

using namespace std;
typedef long long int lint;

typedef struct {
	int x;
	int y;
}coordinate;

//***** Main Program *****

int main() {
	lint x;
	cin >> x;
	vector<pair<lint, lint>> a;
	if (x % 2 == 0) {
		x /= 2;
		a.push_back({ 2,1 });
		while (x % 2 == 0) {
			x /= 2;
			a[0].second++;
		}
	}
	if (x != 1) {
		for (lint i = 3; i <= sqrt(x); i = i + 2) {
			if (x%i == 0) {
				x /= i;
				a.push_back({ i,1 });
				while (x%i == 0) {
					x /= i;
					a.back().second++;
				}
			}
		}
		if (x != 1) {
			a.push_back({ x,1 });
		}
	}
	lint ret = 1;
	Loop(i, a.size()) {
		if (a[i].second % 2 == 1) ret *= a[i].first;
	}
	cout << ret << endl;
	return 0;
}