How to use set_gtm_score

I'm new to Powershell and IControl. I'd like to change a VS score.

I followed Joe's video, I'm now connected to a LTM. So far I've understood that I need to use a ULong64 variable to do that.

PS C:\Program Files (x86)\F5 Networks\iControlSnapIn> $score = $ic.LocalLBVirtualServer.get_gtm_score(("VIP1"))

PS C:\Program Files (x86)\F5 Networks\iControlSnapIn> $score

                                                   high                                                         low
                                                   ----                                                         ---
                                                      0                                                           0

PS C:\Program Files (x86)\F5 Networks\iControlSnapIn> $ic.LocalLBVirtualServer.set_gtm_score(("VIP1"),(????))

How am I suppose to declare those high/low variables ?

Thanks

Bastien