You are given a math word problem and you are supposed to apply a single mathematical operator 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: there were 10 students riding on the school bus . at the first stop 3 students got off of the bus . how many students are left on the bus ?
Example Output: 7

Example Input: the wings now need to be heated . if the oven is at 150 degrees and the required temperature is 546 degrees how many more degrees does the oven temperature need to increase ?
Example Output: 396

Example Input: before they end the meeting tom counted the total number of robots in his collection . he has 6 sets of robots and each set is composed of 7 robots . how many robots does tom have in his collection ?
Example Output:
42