You will be given a definition of a task first, then some input of the task.
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.

Context: David did 27 more push-ups but 7 less crunches than Zachary in gym class today. If Zachary did 5 push-ups and 17 crunches

Question: How many more crunches than push-ups did Zachary do?
Output:
12