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

Example Input: A chef needs to cook 9 potatoes . He has already cooked 7 . If each potato takes 3 minutes to cook , how long will it take him to cook the rest ?
Example Output: 6

Example Input: A new building needed 11 windows . The builder had already installed 4 of them . If it takes 8 hours to install each window , how long will it take him to install the rest ?
Example Output: 56

Example Input: Tanner saved $ 17 in September . He saved $ 48 in October and $ 25 in November . Then Tanner spent $ 49 on a video game . How much money does Tanner have left ?
Example Output:
41