#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;

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

    int m = 55000;
    vector<int> a(m);
    a[0] = 0;
    for (int i = 1; i < m; i++) {
        int x = 1 << 30;
        for (int k = 1;; k++) {
            int l = k * (k + 1) / 2;
            if (l > i) break;
            x = min(x, a[i - l] + 1);
        }
        a[i] = x;
    }

    int i = n;
    int x = 1 << 30;
    for (int k = 1;; k++) {
        int l = k * (k + 1) / 2;
        if (l > i) break;
        if (i - l >= m) continue;
        x = min(x, a[i - l] + 1);
    }

    cout << x << endl;

    return 0;
}