#define _USE_MATH_DEFINES
#pragma region include
#include <iostream>
#include <iomanip>
#include <stdio.h>

#include <sstream>
#include <algorithm>
#include <iterator>
#include <cmath>
#include <complex>

#include <string>
#include <cstring>
#include <vector>
#include <bitset>

#include <queue>
#include <set>
#include <map>
#include <stack>
#include <list>

#include <ctime>
////
//#include <random>//
#pragma endregion //#include
/////////

#pragma region typedef
typedef long long LL;
typedef long double LD;
typedef unsigned long long ULL;
#pragma endregion //typedef
////定数
const int INF = (int)1e9;
const LL MOD = (LL)1e9+7;
const LL LINF = (LL)4e18+20;
const LD PI = acos(-1.0);
const double EPS = 1e-9;
/////////
using namespace::std;

void solve(){
	LL N;
	cin >> N;

	vector<LL> yuki;
	for(LL i=1;;++i){
		LL res = (i*(i+1))/2;
		if( res > N ){
			break;
		}
		yuki.push_back( res );
	}
	int ans = 0;
	vector<LL>::iterator itr;
	while(N){
		itr = lower_bound(yuki.begin(),yuki.end(),N);
		if( itr == yuki.end() ){
			--itr;
		}else if( N < *itr ){
			--itr;
		}
		N -= (*itr);
		++ans;
	}
	cout << ans << endl;
}

#pragma region main
signed main(void){
	std::cin.tie(0);
	std::ios::sync_with_stdio(false);
	std::cout << std::fixed;//小数を10進数表示
	cout << setprecision(16);//小数点以下の桁数を指定//coutとcerrで別	

	solve();
}
#pragma endregion //main()