Math in Storyline?

Does anyone know how to do math operations in the new version of triggers that just came in the new update?

The solution in the video at https://community.articulate.com/discussions/articulate-storyline/performing-arithmetic-operations-with-variables doesn't work anymore because when you add a trigger, adjust variable won't let you choose which variable (see image).  Unless I'm doing something stupid?

Thanks in advance!

 

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