Labelling the last week in a series above threshold

How to label the last week in the series with the total "extra" sales above the threshold for those n weeks in a row as below.

Step 1:

 Find running sum of sales less the threshold.

Step 2: Create a calculation that says if the running sum of weeks is greater than 0 and the next bar is equal to 0, return the number. 

This will show the running total if the number is the last occurrence, but otherwise will show nothing. 

Step 3: 

Bring "Running Sales for Week Series Label" to Label. It displays the required output as below.

Thanks Guru's,

Prazval.ks