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:
Katherine has 34 bottle caps . 8 are eaten by a hippopotamus . How many bottle caps will Katherine have ?

Ex Output:
26


Ex Input:
Melanie had 30 baseball cards , and 9 were torn . Sara bought 18 of Melanie 's baseball cards . How many baseball cards does Melanie have now ?

Ex Output:
12


Ex Input:
If Benjamin skated 80 kilometers at 10 kilometers per hour , how long was Benjamin skating ?

Ex Output:

8