Detailed Instructions: You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
Q: Context: The school is planning a field trip. The school has 102 classrooms. There are 11 students in the school and 99 seats on each school bus. If 8 students do n't want to go for the trip

Question: How many students are going on the trip?
A:
3