How to set trigger on 3 times Shift press in JS?

function Press(){
    document.querySelector("body").addEventListener("keyup", event => {
        if(event.key !== "Shift") return;
        document.getElementById("myElement").click();
        event.preventDefault();
    });
}

I set keyup for press Shift 1 time. How can I set it for 3 fast times? So that after Shift Shift Shift an event (document.getElementById("myElement").click()) is executed?

UPDATE:

this is working code made with @deceze help

function Press(){
    document.addEventListener("keyup", event => {
        if(event.key !== "Shift") return;
        shift_pressed = typeof shift_pressed !== 'undefined' ?  shift_pressed : 0;
        shift_pressed++;
        setTimeout(() => {
            shift_pressed= shift_pressed-1 >= 0 ? shift_pressed-1 : 0;
        }, 1000);
        if (shift_pressed===3){
            document.getElementById("myElement").click();
            shift_pressed=0;
        }
        event.preventDefault();
    });
}

thanks everyone for the help

That should trigger the click on every third press of the Shift key

        function Press(){
            const THRESHOLD = 250;
            let counter = 0;
            let millis = Date.now();
            document.querySelector("body").addEventListener("keyup", event => {
                if(event.key !== "Shift") return;
                if(Date.now()-millis > THRESHOLD) counter = 0;
                if(++counter%3===0) { 
                 document.getElementById("myElement").click();
                 event.preventDefault();
                }
                millis = Date.now();
            });
        }

Just create setTimeout for clearing counter of clicking <kbd>Shift</kbd> and define clearTimeout clear the timeout for every single click.

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

document.getElementById("myElement").onclick = () => {
  console.log('Hello World!');
}

let clearTime = 1000;
let counterShift = 0;
let timeout;
document.querySelector("body").addEventListener("keyup", event => {
    if(event.key !== "Shift") return;
    clearTimeout(timeout);
    counterShift++;
    console.log('number click:',counterShift);
    if(counterShift == 3) {
      document.getElementById("myElement").click();
      event.preventDefault();
      counterShift = 0;
    }
    timeout = setTimeout(()=>{
      counterShift = 0;
    }, clearTime);
});

<!-- language: lang-html -->

<button id="myElement">Test</button>

<!-- end snippet -->