bradford factor

I am trying to add the bradford factor to my spreadsheet
sickness days are recorded with "sick"

As you can see in the example there are three times an employee has been sick
first time for 1 day then 2 then 3 total = 3 occasions
can you help me with the formula that needs to go into the cell J1 so that it adds the occasions and gives a result of 3

Thanks for the help
TJ