How to get count of comments (Append Changes to Existing text)

I have created a custom list in which I have to show the number of comments on a particular item. I have created a calculated column and configured Append Changes to Existing text.I can edit the item and comment on it. It shows all the comments on that perticular item. But I want the count of all the comments too. Can anyone help me out?When I click on the view entries under the comments column I get all the comments on that item as shown in the image below.I want the comments count as 4 from the above image....Read more