PE001. Add all the natural numbers below one thousand that are multiples of 3 or

    class PE001
    {
        static void Main(string[] args)
        {
            var result = Enumerable.Range(1, 999).
                Where(i=>i%3==0 || i%5==0).
                Aggregate((sum, i) => sum + i);

            Console.WriteLine(result);
          }
    }