Cheeku and his Teammates

Cheeku is a good batsman but nowadays things are going $odd$ in his life that’s why he doesn't like the word $odd$, so to tease him, his teammates gave him a number $N$ and told him to assume an array $A$ of size $N$ containing first $N$ odd numbers in sorted manner i.e. $A = \{1,3,5,7….(2*N-1)\}$. But Cheeku doesn't like the word $odd$, so he came up with a way to reduce $odd$ numbers from th