#include <iostream>
#include <algorithm>
using namespace std;

int main(){
    int N;
    cin >> N;
    int ans = 0;
    while(N){
        int triangular_number = 0;
        for(int i = 1; true; i++){
            triangular_number += i;
            if(triangular_number > N){
                N -= triangular_number - i;
                ans++;
                break;
            }
        }
    }
    cout << ans << endl;
}