The Shared Office Printer

An office has a single printer that processes documents in the order they are sent. Each document has a name and a page count. The printer takes 1 second to print 1 page. Given a list of documents in the queue and a target document name, calculate how many seconds the target document has to wait before it starts printing. Assume the printer starts at time 0. Example: Input: 3 DocA 10 DocB 5 DocC 8 DocB Output: 10 (Explanation: DocA takes 10 seconds. DocB starts immediately after DocA finishes.)