#include <bits/stdc++.h>

using namespace std;

using int64 = long long;

int main()
{
  int N;
  cin >> N;

  vector< int > vs;
  for(int i = 1; i * (i + 1) / 2 <= N; i++) {
    vs.push_back(i * (i + 1) / 2);
  }

  int ret = 0;
  while(N > 0) {
    int last = 0;
    for(auto &p : vs) {
      if(N >= p) last = p;
    }
    N -= last;
    ++ret;
  }
  cout << ret << endl;

}