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:
Mrs. Hilt had 15 cents . She bought a pencil for 11 cents . How much money did she have left ?

Ex Output:
4

Ex Input:
Each CD rack holds 8 CDs . A shelf can hold 4 racks . How many total CDs can fit on the shelf ?

Ex Output:
32

Ex Input:
There are 41 pencils in the drawer . Mike placed 30 pencils in the drawer . How many pencils are now there in total ?

Ex Output:
71