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

Example Input: 2 beavers were working on their home . 1 went for a swim . How many beavers are still working on their home ?
Example Output: 1

Example Input: The school is planning a field trip . There are 45 students and 9 seats on each school bus . How many buses are needed to take the trip ?
Example Output: 5

Example Input: There are 6 birds and 3 nests . How many more birds are there than nests ?
Example Output:
3