#include<cstdio>
#include<cstring>
#include<vector>
#include<queue>
#include<stack>
#include<algorithm>
#include<cmath>
#include<climits>
#include<string>
#include<set>
#include<numeric>
#include<map>
#include<iostream>
using namespace std;
#define rep(i,n) for(int i = 0;i<((int)(n));i++)
#define reg(i,a,b) for(int i = ((int)(a));i<=((int)(b));i++)
#define irep(i,n) for(int i = ((int)(n)-1);i>=0;i--)
#define ireg(i,a,b) for(int i = ((int)(b));i>=((int)(a));i--)
typedef long long ll;
typedef pair<ll, ll> mp;
ll mod = 1e9+7;
ll inf = 1e18;

//AC

map<ll,ll> a;

int main(void){
	ll n,ans=0;
	cin>>n;
	while(n>0){
		ireg(i,1,sqrt(2*n)+10){
			if(i*(i+1)/2<=n){
				n-=i*(i+1)/2;
				ans++;
				break;
			}
		}
	}
	cout<<ans<<endl;
	return 0;
}