Probation period alert notification

Summary:

We created a probation period alert notification, we need to add a filter that evaluates whether the probation period is bigger than 35 days, however when I add the expression the following message appears

The filter expression is invalid. The error message is: ${ProbationPeriod} >= 35 . (HRC-1035496)

What is the correct expression to validate the probation period in days?

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