You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Example Input: Mrs. Hilt saw a rollercoaster . 7 students rode the rollercoaster every 5 minutes . How many students rode the rollercoaster in 15 minutes ?
Example Output: 21

Example Input: For Halloween Debby and her sister combined the candy they received . Debby had 32 pieces of candy while her sister had 42 . If they ate 35 pieces the first night , how many pieces do they have left ?
Example Output: 39

Example Input: Jonathan wants to buy a dictionary that costs $ 11 , a dinosaur book that costs $ 19 , and a children 's cookbook that costs $ 7 . He has saved $ 8 from his allowance . How much more money does Jonathan need to buy all three books ?
Example Output:
29