Instructions: You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
Input: A physician 's assistant measures a child and finds that his h8 is 41.5 inches . At his last visit to the doctor 's office , the child was 38.5 inches tall . How much did the child grow , in inches ?
Output:
3