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:
Mary starts with 27 eggs . She finds another 4 . How many eggs does Mary end with ?

Ex Output:
31


Ex Input:
Sara has 10 marbles . She loses 7 . How many marbles will Sara have ?

Ex Output:
3


Ex Input:
A perfect score is 21 points . How many points would you have after 3 perfect games in a row ?

Ex Output:

63