How can I use for loop on equation with const

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Javascript

<pre>updateTotal();

function increaseCount(e, el) {
  var input = el.previousElementSibling;
  var value = parseInt(input.value, 10);
  value = isNaN(value) ? 0 : value;
  value++;
  input.value = value;
  updateTotal();
}

function decreaseCount(e, el) {
  var input = el.nextElementSibling;
  var value = parseInt(input.value, 10);
  if (value > 1) {
    value = isNaN(value) ? 0 : value;
    value--;
    input.value = value;
    updateTotal();
  }
}

function decreaseCount2(e, el) {
  var input = el.nextElementSibling;
  var value = parseInt(input.value, 10);
  if (value > 0) {
    value = isNaN(value) ? 0 : value;
    value--;
    input.value = value;
    updateTotal();
  }
}

$('#datepicker').datepicker({
  minDate: 0,
  dateFormat: "dd-mm-yy"
});

function calculateTotal() {
  const privateAdultPrice = 500;
  const privateAdultPrice2 = 125;



  const adults = +document.querySelector('#adults').value;


  const isPrivate = document.getElementById('private').checked;


  const adultPrice = privateAdultPrice + (adults -1) * privateAdultPrice2

  return adultPrice;
}

function updateTotal() {
  const total = calculateTotal();
  console.log(total);
  document.querySelector('#amount').value = total;

  
}
updateTotal();

hi i want to apply loop for on this equation const adultPrice = privateAdultPrice + (adults -1) * privateAdultPrice2 and setting the limit on adults that after every 4 it repeats

is it possible or i am in in illusion which is not possible at-all please help me on this one

javascript

What I have tried:

for (let i = adultprice ; adults < 4; i++)