I think we're getting closer, but I'm still not sure I'm completely understanding what you need.
I do think we have a bit of a language barrier, but I would not give up and say what you want to do is not possible.
So you have three attacks, each triggered by its own key press. The total value of all three attacks is displayed.
What do you want to subtract from the enemy's hit points? The sum of all three values, or do you just want to subtract ONE of the three values from the enemy's hit points?