#include "bits/stdc++.h"
using namespace std;
#ifdef _DEBUG
#include "dump.hpp"
#else
#define dump(...)
#endif

#define int long long
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define all(c) begin(c),end(c)
const int INF = sizeof(int) == sizeof(long long) ? 0x3f3f3f3f3f3f3f3fLL : 0x3f3f3f3f;
const int MOD = 1'000'000'007;
template<class T> bool chmax(T &a, const T &b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, const T &b) { if (b < a) { a = b; return true; } return false; }

// 約数 未ソート
vector<int> getDivisors(int x) {
	vector<int> ret;
	int i;
	for (i = 1; i*i < x; i++) {
		if (x%i)continue;
		ret.emplace_back(i);
		ret.emplace_back(x / i);
	}
	if (i*i == x)
		ret.emplace_back(i);
	return ret;
}

signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int N; cin >> N;
	vector<int> d = getDivisors(N);
	sort(all(d));
	if (N % 2) {
		cout << d[1] << endl;
	}
	else {
		cout << d[2] << endl;
	}
	return 0;
}