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.

Ex Input:
April 's discount flowers was having a sale where each rose was 9 dollars . If April started with 11 roses and had 8 roses left , how much money did she earn ?

Ex Output:
27


Ex Input:
Isabel had 2 pages of math homework and 4 pages of reading homework . If each page had 5 problems on it , how many problems did she have to complete total ?

Ex Output:
30


Ex Input:
A waiter had 21 customers in his section . If 12 of them left and the rest of his tables had 3 people at each table , how many tables did he have ?

Ex Output:

3