how to get the max week number by ignored the data slicer but the week slicer still works

[Cyouth]

data source: one date table,

dashboard:  I have two slicers on one page, one is the date slicer and the other is the week number slicer , these two slicers are all the numeric range and can't interact each other( i set up the interaction), now I want to know the max week number in the week number slicer, how to write the measure. 

i don't know whether you can understand , 

[amitchandak]

@Cyouth , Hope they are not from the same table

Try a measure like

Maxx(allselected(Week[Week]), Week[Week])

[Cyouth]

but in this case ,they are from one table, so , whether we got a way to write the measure?