#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)

typedef long long ll;

vector<bool> primes;
void make_primes(int n)
{
	primes.resize(n + 1, true);
	primes[0] = primes[1] = false;
	rep(i, 2, sqrt(n))
	{
		if (primes[i])
		{
			for (int j = 0; i * (j + 2) < n; j++)
				primes[i * (j + 2)] = false;
		}
	}
}

int main()
{
	ll N; cin >> N;
	make_primes(1000001);

	rep(i, 2, sqrt(N) + 1) if(primes[i])
	{
		ll j = (ll)i * (ll)i;
		while (N % j == 0) N /= j;
	}

	cout << N << endl;
}