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Create Custom Poller FreeMemory

I am playing around with creating custom pollers. I have the CPU Load and Memory Utilization, but I don't have a number for the FreeMemory. I do have the total system memory. So, I'm thinking I need to do something like the following:

[sysMemory]*(100-[memoryUtilization])

However, the poller doesn't allow me to do this calculation. I get the following error.

Error in calculation (Operator '*' can't be applied to operands of types 'ulong' and 'long')

If I change the () to [] I get the following error.

Error in calculation (Parameter was not defined Parameter name: 100-[memoryUtilization)