Count without duplicates Power BI

Question

I have a table like -

Seller	Value
Ron	0
Jon	12
Ron	12
Jon	13
Harry	121
Saw	0

I need to count the seller if its value is not zero and non-duplicate.

Here the seller count would be 2.

Explanation -

Since Ron is available twice but one time its value is 0 so we will eliminate it. Jon has value but it appears twice thus we count it as 1. Harry is available only one time so the total count is 2 now. Saw has 0 value, so we will not count it.

The expected output is -> Total Seller count = 2

Answer 1

Measure = 
VAR a = COUNTROWS(VALUES('Table'[Seller]))
VAR b = COUNTROWS( SUMMARIZE( FILTER('Table', 'Table'[Value] = 0), 'Table'[Seller]))

RETURN a-b