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: joe had 50 toy cars . if he gets 12 more cars how many cars will he have then ?
Example Output: 62

Example Input: on facebook debby had 63 photos of her friends and 23 photos of her family . how many photos did she have total ?
Example Output: 86

Example Input: there are 6 birds and 3 nests . what 's the difference of the number of birds and nests over there ?
Example Output:
3