#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main() {
  long long n;
  cin >> n;

  int ans = 0;
  for (long long i = 10000; i >= 1; i--) {
    while (n >= i * (i + 1) / 2) {
      n -= i * (i + 1) / 2;
      ans++;
    }
  }
  cout << ans << endl;
}