using System;
using System.Collections.Generic;
using System.Linq;

class Solution
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine());
        var tri = new List<int>();

        int i = 1;
        while (true)
        {
            var t = i * (i + 1) / 2;
            if (t <= n)
            {
                tri.Add(t);
            }
            else
            {
                break;
            }
            i++;
        }

        int count = 0;
        tri.Reverse();
        foreach (var t in tri)
        {
            if (t <= n)
            {
                var x = n / t;
                n -= t * x;
                count += x;
            }

            if (t == 0)
            {
                break;
            }
        }


        Console.WriteLine(count);
    }
}