Lets Play It Again!

After getting a magnificent response from Guddu to the previous puzzle. Bablu gives him yet another situation and asks Guddu to answer it. But as always, he is not able to answer it, and so, you have to answer it. Guddu and Bablu are Lions of Mirzapur, so they don’t play such games. They made Alice and Bob play it, just like the last time. As usual **Alice** and **Bob** have $N​$ piles of stones.