Reconstruct a question, answer pair from this explanation: The injury would be fully healed after 3 * 5 = 15 days. So he would start exercising again in 15 + 3 = 18 days. He would then wait for 3 * 7 = 21 more days to start lifting heavy again. That means he needs to wait 18 + 21 = 39 days.

Q:James hurt himself exercising. The pain subsided after 3 days, but he knew that the injury would take at least 5 times that long to fully heal. After that, he wanted to wait another 3 days before he started working out again. If he wants to wait 3 weeks after that to start lifting heavy again, how long until he can lift heavy again?
A:39