using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

    }

​

    public static void Multiples3And5()

    {

        int sum = Enumerable.Range(0, 1000).Where(n => n % 3 == 0 || n % 5 == 0).Sum();

        Console.WriteLine(sum);

    }

}