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: There are 97 erasers in a box . Ernest has 17 erasers in a bag . Mark takes 97 erasers out of the box . How many erasers are left in the box ?
Example Output: 0

Example Input: Joshua has 40 bottle caps . He buys 7 more . How many bottle caps does Joshua have in all ?
Example Output: 47

Example Input: Melissa scored 120 points in each game . How many points did she score in 10 games ?
Example Output:
1200