using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int rc = 51273;

        int bc = 1000;

        var bb = (rc - 1) / bc;

        var rm = (rc - 1) % bc;

        if(rm > 0)

            bb++;

        Console.WriteLine(bb);

        Console.WriteLine(rm);

        for(var i = 0; i < bb; i++)

        {

            var end = (i + 1) * bc;

            var cc = bc;

            if(end > rc - 1)

            {

                end = rc - 1;

                cc = rm;

            }

            Console.WriteLine("{0}. Start: {1} | End: {2}", i + 1, (i * bc) + (i == 0 ? 2 : 1), end);

            var rr = Enumerable.Range((i * bc) + 1, cc);

            Console.WriteLine($"{rr.First()} | {rr.Last()}");

        }

    }

}