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.

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

Ex Output:
168

Ex Input:
For the fifth grade play , the chairs have been put into 27 rows with 16 chairs in each row . How many chairs have been put out for the play ?

Ex Output:
432

Ex Input:
Jeremy strolled 20 kilometers at 2 kilometers per hour . How long did Jeremy stroll ?

Ex Output:
10