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

int main() {
	vector<int> v(10000);
	for (int i = 1; i <= 10000; i++) {
		v[i - 1] = i * (i + 1) / 2;
	}
	reverse(v.begin(), v.end());
	int n, ans = 0;
	cin >> n;
	for (auto &i : v) {
		ans += n / i;
		n -= n / i * i;
	}
	cout << ans << endl;
	return 0;
}