Formula for soonest date from a range of date columns

Hi All,

Can anyone help with a formula for displaying the first date from a range of dates?

I have multiple Expiry dates columns (15) and would like to display the soonest expiry date in a single column at the start of the board for easier tracking and filtering.

A bonus would be to perform a notify automation based on that upcoming expiry date, but I know there are big limitations using the formula column with automations.

Thanks in advance!