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

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            var X = Console.ReadLine().Split().Select(int.Parse).ToArray();
            var a = X[0];
            var b = X[1];
            var c = X[2];
            var d = (0);
            while (true)
            {
                if (a == b)
                    break;
                var x = c % a;
                if (x == 0)
                {
                    d = d + 1;
                }
                a = a + 1;
            }
            Console.WriteLine(d);
        }
    }
}