Detailed Instructions: You are given a paragraph, containing several sentences, and a question about the paragraph. The given question might contain grammatical errors, typing mistakes, etc., or might not make sense in the context of the paragraph (for instance, it might not be related to the content of the paragraph or not be answerable at all). Your task is to generate the corrected question in your response. Do not write a question that is very different from the given question. Instead, you should correct it by applying minimal edits to the words in the given question, such that your generated response remains similar to the given question.
Q: Paragraph- Sent 1: Susan wanted to have a birthday party.
Sent 2: She called all of her friends.
Sent 3: She has five friends.
Sent 4: Her mom said that Susan can invite them all to the party.
Sent 5: Her first friend could not go to the party because she was sick.
Sent 6: Her second friend was going out of town.
Sent 7: Her third friend was not so sure if her parents would let her.
Sent 8: The fourth friend said maybe.
Sent 9: The fifth friend could go to the party for sure.
Sent 10: Susan was a little sad.
Sent 11: On the day of the party, all five friends showed up.
Sent 12: Each friend had a present for Susan.
Sent 13: Susan was happy and sent each friend a thank you card the next week. 
Question: Which sentences mention parents?
A:
How many friends did susan have?