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 41 short trees and 44 tall trees currently in the park . Park workers will plant 57 short trees today . How many short trees will the park have when the workers are finished ?
Example Output: 98

Example Input: Fred has 709 green balloons , he gave Sandy 221 of the balloons . How many green balloons does he now have ?
Example Output: 488

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