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

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        getAns(n);
    }
    static void getAns(int n)
    {
        var hs = new HashSet<int>();
        for (int i = 1; i <= n; i++) hs.Add(n / i);
        Console.WriteLine(hs.Count());
    }
}