Report on multiple course completion

Hi all, 

Here is the problem I am trying to solve and so far failed in PowerBI. 

I have a lot of customers attending multiple workshops and there are 5 workshops in the course. I can create a table which contains all the data I need to aggregate. Customers, unique email address per customer, unique session attendance.

All the unique columns are counting unsig distinct selection so my end result table is something like:

What I would like to create a table or visual for is how many of the customers completed all 5 sessions in the course. How many completed 4, 3, 2 and 1. I am able to get a visual showing how many customers completed workshop 1, 2 etc, but not how many have compelted all 5, 4, 3 etc. 

Sessions completed are also not sequential. Some customer completed session 1,3 and 4 for a total of three, while another customer completed session 1,2,3 for a total of three. 

Using the sample above, 3 customer completed all 5 workshops, 2 customers 4 workshops, 3 customers 3 workshops, 1 customer 2 and 1 customer 1 workshops. 

Thanks in advance.