using System;

public class Program

{

    public static void Main()

    {

        const int total = 5001;

        const int numberOfChunks = 2;

        const int chunkSize = 5000;

        var startId = 42;

        var lastId = startId + total - 1;

        Console.WriteLine($"StartId {startId}, LastId {lastId}");

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

        {

            var endId = startId + chunkSize - 1;

            if (endId > lastId) endId = lastId;

​

            Console.WriteLine($"Chunk StartId {startId}, EndId {endId}");

            startId = endId + 1;

        }

    }

}