using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int i =0;

        for(int j=0; j< 1000 ; j++)

        {

            if( j % 3 == 0 || j % 5 == 0)

            {

                i = i+j;

            }

        }

        Console.WriteLine("sum is {0}", i.ToString());

    }

}