profit / loss at expiry if price closed below,above or at breakeven point

hello fellows,

I`m new here and to trading, I`m intrested in selling European indices options (DAX.FTSE.CAC.EuroNXT50 ). but I can`t understand how profit and loss is calculated at expiry if price closed near to break-even point , I hop someone helps
me here;
suppose for example I sell deep ITM put at strike price 12760 on the DAX (will expire today at market close) for a premium of 144.2 .my beak-even point is 12615.8
how much of the premium I will keep if the position expired at 12616.8 just one point above my break even point . will I keep all the 144.2 premium, or my profit depends on how close the closed price is close to break even point ?

thanks for your response in advance:

profit / loss at expiry if price closed below,above or at breakeven point