How to make something happen only after pushing all buttons

[boj]

I have 4 buttons that open different parts.

I would want to make a message show up on the screen using the game_text entity once the player has pressed all 4 buttons.

How would I go about doing that?

I'm making it in Half Life 2

[marnamai]

use a math_counter, set the max legal value to 4

add this output to each button "onpressed/math_counter/add/1" make sure to check the fire only once checkbox

add this output to the math_counter "onhitmax/game_text/display"

[Les_Grossman]

math_counter with max legal value set to 4

every button has output:
on pressed > math_counter > add > 1

and math_counter has output:
onhitmax > game_text > display/enable (or whatever)

edit: ninjad xd

[marnamai]

huehuehue :p

[boj]

thank you both very much, it all worked