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: Carol starts with 42 blocks . She loses 25 . How many blocks does Carol end with ?
Example Output: 17

Example Input: Before December , customers buy 1346 ear muffs from the mall . During December , they buy 6444 more , and there are none left . In all , how many ear muffs do the customers buy ?
Example Output: 7790

Example Input: I walk 1 mile every 15 minutes . I walked 3 miles . How many minutes did it take me ?
Example Output:
45