Count measure with date intelligence

[mbueno]

Hello guys, I've a question with count in measures.

I've a initial matrix as distinct count of client that bought on these months.
Column: Date
Row: ID Client

ID Client	jan	feb	mar	apr	may
10010		1
10011		1	1
10012			1
10013			1
10014			1

In other words, the acumulated of sales in 12M is like: 

measure_Sale_12M = 
CALCULATE(DISTINCTCOUNT('General Key'[Client ID]),
DATESBETWEEN(Calendar[Date],
            DATEADD(
            LASTDATE(Calendar[Date]),-12,MONTH),
            LASTDATE(Calendar[Date]) 

))

Client Code	jan/21	feb/21	mar/21	apr/21	may/21
10010		1	1	1	1
10011		1	1	1	1
10012			1	1	1
10013			1	1	1
10014			1	1	1

In this way, I've calculated the difference of month and month-1 to result like this: 

measure_Sale_12M-1 = 
CALCULATE([measure_Sale_12M],
 DATEADD(Calendario[Date], -1, MONTH)

)

and then

metric_final = [measure_Sale_12M]-[measure_Sale_12M-1]

resulting this:

Client Code	jan/21	feb/21	mar/21	apr/21	may/21
10010		1	0	0	0
10011		1	0	0	0
10012			1	0	0
10013			1	0	0
10014			1	0	0

This way I got active client (result 0), new client (result 1) and lost client(-1) in table. 

But my problem is here. How can I count the 0? I'm just using matrix visual, I don't have table only for this operation, just a general database. How do I a measure to give count this?

In practical example, PBI show me this: 

Thank you,

[amitchandak]

@mbueno , Add +0 and Try

metric_final = [measure_Sale_12M]-[measure_Sale_12M-1]+0

[mbueno]

Hey amitchandak, thank you for the answer but it didn't work 😥

metric_final = [measure_Sale_12M]-[measure_Sale_12M-1]+0

Before: 

After: 

And then when I filter with "metric_final is 0" on september ... show me this, doesn't counting