public class Shell
{
    public static int sort(double[] a) {
        int N = a.length;
        int cnt = 0;
        int[] incs = { 1391376, 463792, 198768, 86961, 33936, 13776,
                       4592, 1968, 861, 336, 112, 48, 21, 7, 3, 1 };
        for (int k = 0; k < incs.length; k++) {
            int h = incs[k];
            for (int i = h; i < N; i++) {
                for (int j = i; j >= h; j-= h) {
                    cnt++;
                    if (less(a, j, j-h)) exch(a, j, j-h);
                    else                    break;
                }
            } 
        }
        return cnt;
    }

    private static boolean less(double[] a, int i, int j)
    {   return (a[i] < a[j]);   }
        
    private static void exch(double[] a, int i, int j) 
    {
        double swap = a[i];
        a[i] = a[j];
        a[j] = swap;
    }

   public static void main(String args[]) 
   {
      int N = Integer.parseInt(args[0]);
      double[] a = new double[N];
      for (int i = 0; i < N; i++)
         a[i] = Math.random();
      StdOut.println(sort(a) +  " comparisons");
   }
}