Weird Game

You were playing a game and now you have stumbled upon a bag .The bag contains $N$ potions.The $i^{th}$ [ $1 \leq i \leq N$ ] potion will increase your health by $a[i]$. But each time you pick a potion your health increases by $a[i]$ but the value of all the remaining potions decreases by one. Find any valid permutation by which the potions should be picked such that your final health is maximi