Queue

You are standing in a queue with $N$ people in front of you, numbered $1$ to $N$. Person $1$ is at the front of the queue, and person $N$ is towards the back of the queue, and you are behind person $N$. You have to wait for the people in front of you to exit the queue before you can reach the front, which is your goal. You know that the $i$-th person will take exactly $A_i$ units of time to exit