How to Count an Input, key press on keyboard

I am trying to count how many times the user has pressed a certain key on the keyboard.

Something like the code below, except of course the code below increments count by number of frames key 1 was held down.

How can just get the count of that key 1 press? I could add a boolean to keep track of the key pressed/released, but I can't find in the docs how i can get those keyboard events.

var count = 0;

function Update() { if(Input.GetKey("1")) { count++; } }