#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
void Say(bool say, string a = "Yes", string b = "No"){cout << (say ? a : b) << endl;};

int main(){

    set<ll>S;
    for(ll i = 1; ; i++){
        ll t = i * (i + 1) / 2;
        if(t > 10000000)break;
        S.insert(t);
    }
    ll N;
    cin >> N;
    ll ans = 0;
    while(N){
        set<ll>::iterator it = S.lower_bound(N);
        if(*it > N)it--;
        N -= (*it);
        ans++;
    }
    cout << ans << endl;

    return 0;
}