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 79 pencils in a box . Eric takes 4 pencils . How many are left ?
Example Output: 75

Example Input: Nancy grew 6 potatoes . Sandy grew 7 potatoes . How many potatoes did they grow in total ?
Example Output: 13

Example Input: Eric has 3 boxes of pencils . Each box holds 9 pencils . How many pencils does Eric have ?
Example Output:
27