using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<int> items = new List<int>(){2,1,5,3,4,6,7,8,9,10,11,12,13,14,15};

        int[] arr1 = new int[5];

        int[] arr2 = new int[5];

        int[] arr3 = new int[5];

        int j = 0;

        int k =0;

        int l =0;

        for(int i=0; i < items.Count; i++)

        {

           if(i>=0 && i<5)

           {

               arr1[j++]=items[i];

               continue;

           }

           if(i>=5 && i<10) 

           {

                arr2[k++]=items[i];

               continue;

           }

          if(i>=10 && i<15) 

           {

                arr3[l++]=items[i];

              continue;

           }

        }

        Array.Sort(arr1);

        foreach(var item in arr1)

        {

             Console.WriteLine(item);

        }

    }

}