#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;


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

  vector<int> v;
  {
    int k = 1;
    while(true){
      ll x = k * (ll)(k+1) / 2;
      v.push_back(x);
      if(x > N) break;
      k++;
    }
  }

  int ret = 0;
  while(true){
    int i = 0;
    for(; i<v.size(); i++){
      if(v[i] <= N && N < v[i+1]) break;
    }
    ret++;
    N -= v[i];
    if(N <= 0) break;
  }

  cout << ret << endl;
  
  return 0;
}