How do I make the system no longer work when the value is 0?

I'm new to game development so I don't know how to use construct 3 program very well. I'm making an interactive story game and I made a ticket system. Each time we make a choice, the number of tickets decreases by 1. However, I can choose even when the number of tickets is 0. How do I make sure that when the ticket count value is 0, no selection can be made anymore, friends? (Sorry for my bad English.)

I couldn't do much because I didn't know that an extra condition could be added to the event section. My ignorance made me laugh :D Thanks for your help!

No problem! Some other tips that may help you down the road:

Sub-events can help when the behavior you're looking for gets more complex.

Blocks of conditions can be changed from "and" to "or."

You can create categories/groups and comments in the event sheet for much better organization. It really helps productivity when there's not a giant page open the whole time.

Many thanks for the tips! It's really fun to learn how to make games slowly :)