using System;

public class Hello
{
    public static void Main()
    {
        var c = getC();
        var n = int.Parse(Console.ReadLine().Trim());
        var ans = 0;
        while (n > 0)
        {
            var a = getP(c, n);
            if (c[a] ==n) { ans++;  break; }
            ans += n / c[a - 1];
            n -= (n / c[a - 1]) * c[a - 1];
        }
        Console.WriteLine(ans);
    }
    public static int[] getC()
    {
        var c = new int[4471];
        for (int i = 1; i <= 4471; i++)
            c[ i -1] = i * (i + 1) / 2;
        return c;
    }
    public static int getP (int[] c , int n)
    {
        var ng = 0;  var ok = c.Length - 1;
        while (ok - ng > 1)
        {
            var mid = ng + (ok -ng) / 2;
            if (c[mid] >= n) ok = mid;
            else ng = mid;
        }
        return ok;
    }
}