Which Power Adapter?

[Alameda]

I have a MacBook Pro (13-inch, 2018, Four Thunderbolt 3 Ports) with basic Intel Iris Graphics.

I've lost my original power adapter. Which should I buy? Apple sells a 30W, 61W, and 87W USB Type-C power adapters.

Thank you in advance!

 

[benshive]

According to Apple that model comes with a 61W adapter.