hey guys, I'm planning to resign from my current job soon. I'm supposed to give a 2-month notice but I'm planning to give about 1-month and a half notice due to certain circumstances. Here's what it says in my offer letter

The period of notice for termination shall be two months or salary in lieu of notice. This notice shall be in written form and the commencement of notice period shall be calculated from the date the said written notice is notified receipt by the employee or the company as the case may be.

So does it means that I only have to pay a compensation of half a month salary? or is it either 2-month notice or pay 2 months salary? (as in nothing in between)