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

class Program
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine());
        var iter = Enumerable.Range(1, n);
        HashSet<int> set1 = new HashSet<int>();
        
        foreach (var k in iter)
        {
            set1.Add((int) n / k);
        }

        Console.WriteLine(set1.Count);
    }
}