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: There are 6 candies in a pile on the desk . Each candy comes in a package of 15 . 4 candies are added to the pile . How many candies are there in the pile ?
Example Output: 10

Example Input: Clarence has 99 tickets . He gives 7 to Eugene . How many tickets will Clarence have ?
Example Output: 92

Example Input: Carla has some marbles . She bought 134 marbles . Now she has 187 marbles . How many did she start with ?
Example Output:
53