<s>[INST] A project consists of 3 tasks: A, B, and C. Task A has an expected duration of 4 days, task B of 5 days, and task C of 2 days. The tasks depend on each other as follows: Task A has to be completed before tasks B and C can start. Task B and C do not depend on each other and can run in parallel. However, task B has to be completed before the project can be concluded. The project manager wonders: What is the expected project duration?[/INST]