using System;

public class Program

{

    static int countDivisibles(int a, int b, int k) 

    {         

        if (a % k == 0) 

            return (b / k) - (a / k) + 1; 

        else

            return (b / k) - (a / k); 

    } 

    public static void Main()

    {

        int t, a, b, k, r;

        t = Int32.Parse(Console.ReadLine());

        for (int i = 0; i < t; i++)

        {

            a = Int32.Parse(Console.ReadLine());

            b = Int32.Parse(Console.ReadLine());

            k = Int32.Parse(Console.ReadLine());

            r = countDivisibles(a, b, k);

            Console.WriteLine("CASE " + (i + 1) + ": " + r); 

        }

    }

}