Trying to create blueprint for a button mashing sequence game.

I’m attempting to create a minigame where the player needs to repeatedly mash 4 buttons in order until a specific threshold is met. I understand that I need to assign a value and then have pressing the keys increase the value by a certain amount, but I’m confused on how to make it so it works with a sequence of buttons rather than just one button.

Tell me how to do the ‘button mash’ correctly? What do I need to do to the buttons?