Do something if condition in reaction is not accomplished?

Hello,

maybe I’m overlooking something simple, but for now I don’t see a solution how to solve this…

In reactions there are what we listen. Next, if “condition” is accomplish then we do something. But I do not see how to add something to do if condition is not accomplished?

For example:

We listen: Button1 is pressed.

Condition 1: if “parameter X” is 0 then we do:
xxxx
xxxx
127 —> “parameter X”
xxxx

and if i put in “next bolck” condition (in same reaction):
Condition 2: If “parameter X” is 127 then we do:
xxxx
xxx
xxxx

this parameter is alredy changed in codiotion before and bought conditions will be exercuted with same reaction.
I try to sepateate these conditipns in two reactions, and get the same results.