Reporting Services :: Multi Value Integer Parameter For A Report

I'm building a report and I want to have a parameter that has multiple integer values (not text).I can get it to work just fine if I create a value for each and every numeric value, but I want the user to only see two choices in the dropdown menu (plus the "Select All" that gets automatically created when I tick the box for "Allow multiple values"). How can I make this work?

For example, for my TYPE parameter I'd like something like this:
Label: Tigers
Value: 2
Label: Lions Bears Oh My
Value: 1,3,4,5,6

But I can't seem to set a multiple Value for an integer. And I can't seem to wrap the value with quotes and use Text as the Data Type because it says an error occured during processing (I assume because the field I'm going against is of the Integer format).My query would look something like this (the real one is a lot more complex):

SELECT
v_R_System.Netbios_Name0
,v_GS_COMPUTER_SYSTEM_EXT.PCSystemType0
FROM
v_R_System
INNER JOIN v_GS_COMPUTER_SYSTEM_EXT
ON v_R_System.ResourceID = v_GS_COMPUTER_SYSTEM_EXT.ResourceID
WHERE
v_GS_COMPUTER_SYSTEM_EXT.PCSystemType0 IN (@TYPE)

I've tried different Expressions, filters, options, syntax, and what-not, but I think I'm missing something basic.