using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] numbersArray = new int[1000];

        for (int i = 0; i < numbersArray.Length; i++)

        {

            numbersArray[i] = i; //Assign number from 0-1000

        }

        var grouped = numbersArray.GroupBy(x => x % 30);

        foreach (var g in grouped)

        {

            Console.WriteLine(g.Key);

            Console.WriteLine("Group consists of " + string.Join(";", g));

        }

    }

}