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: A restaurant served 6 cakes during lunch and 9 during dinner today . How many cakes were served today ?
Example Output: 15

Example Input: Mrs. Hilt reads 5 books a day . How many books does she read in 3 days ?
Example Output: 15

Example Input: We ordered 21 pizzas . Each pizza has 8 slices . How many slices of pizza are there altogether ?
Example Output:
168