UVW Select Faces

Hi,

I am working with 3ds MAX 2010 DE
I would like to use

$.modifiers[#unwrap_uvw].unwrap2.scaleSelectedXY 0.5 0.5 [0,1,0]

but before I have to select all faces, so I use

$.modifiers[#unwrap_uvw].unwrap2.selectFaces #{1..???}

I do not know how to find out the count of Faces.
Can someone help?