formula to count the number occasion

Hi

I'm Hoping someone can help

I am making a attendance record and need a formula that works out the number of sick occasion a employee has

For example an employee is of sick 3 day MON,TUE,WED- this 1 occasion BUT if the employee was sick MON,WED,SAT - this 3 occasion

Also

I also need a formula that counts the number of time a employee is sick before or after a day off.

I attached the excel file

I would appreciate any advice