using System;

public class Program

{

    public static void Main()

    {

        int[] arr = new []{1,4,33,6,78,32,64,17,324,234, 664, 12};

        int n = arr.Length/5 + (arr.Length%5 > 0 ? 1 : 0);

        for (int k = 0; k < n; k++){

            for (int i = k*5 + 1; i < (k+1)*5 && i < arr.Length; i++){

                int x = arr[i];

                int j = i;

                while (j > k*5 && arr[j-1] > x){

                    arr[j] = arr[j-1]; j--;

                }

                if (j < i){

                    arr[j] = x;

                }

            }

        }

​

        Console.WriteLine(string.Join(", ", arr));

    }

}