Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

Example Input: in a school there are 542 girls and 387 boys . how many pupils are there in that school ?
Example Output: 929

Example Input: 13 ducks are swimming in a lake . 20 more ducks come to join them . how many ducks are swimming in the lake ?
Example Output: 33

Example Input: kaleb has 17 shirts . if he got rid of 7 of them how many shirts would kaleb have ?
Example Output:
10