Run sql query on Max(Week) column in sql server

Question

suppose I have records like 

ArtNo                                 Week

A1	2
A2	2
A3	2
A4	1
A4	4
A3	6
A5	6

Result should be 

A1	2
A2	2
A3	6
A4	4
A5	6

In the result rowsets I need distinct ArtNo with there Max WEEk.

NEED HELP...