import java.util.*;
import java.io.*;

public class Main {
    static int[] coins;
    static HashMap<Integer, Integer>[] maps;
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        coins = new int[5000];
        maps = new HashMap[5000];
        for (int i = 1; i < 5000; i++) {
            coins[i] = i * (i + 1) / 2;
            maps[i] = new HashMap<Integer, Integer>();
        }
        System.out.println(dfw(4999, n));
    }
    
    static int dfw(int idx, int value) {
        if (value < 0) {
            return Integer.MAX_VALUE / 10;
        }
        if (value % coins[idx] == 0) {
            return value / coins[idx];
        }
        if (maps[idx].containsKey(value)) {
            return maps[idx].get(value);
        }
        int min = Math.min(dfw(idx - 1, value), 1 + dfw(idx - 1, value - coins[idx]));
        maps[idx].put(value, min);
        return min;
    }
}