The instance variable Bulbausur in text is updated with Text.Bulbausur*200, as you ask it to do.
But, you do it on each tick. Wich leads to a infinity number real soon.
I suppose you meant event 3 to be a SUB-EVENT to event 2. Just drag 3 under 2.
I also suppose that you wanted to writte the multiplication outcom in the textfield, not in the the Bulbausur variable. So ... Text > set text > str(Text.Bulbausur*200)
Tip: you can translate the string of the input to a number with: int (CPBox.Text).
Now the calculation = int(CPBox.Text) * Text.Bulbausur