I have a sample data as below and I would like to create a powerbi card. The dax code should first groupby based on Source and add the sum of max(FYandFW). How to get around with this ?

Source  FYandFW num sum
Company A   202453  1**
Company A   202452  2
Company A   202451  3
Company B   202501  4
Company B   202502  5** 
Company B   202453  6

Expected Answer 1+5 = 6