Chef and Invigilator

Chef is on his invigilation duty and now it's the time to collect the answer sheets of $N$ students. All the $N$ students are sitting in a single row but instead of sitting in order of their roll numbers they sat randomly. Now, Chef has to collect the answer sheets roll number wise. Chef's initial position is at the $Desk 1$. Find the $minimum$ number of moves to collect all the $N$ answer