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:
Mike has 8 orange marbles , he gave Sam 4 of the marbles . How many orange marbles does he now have ?

Ex Output:
4


Ex Input:
There are 4 cards . 3 cards more are added . How many are there total ?

Ex Output:
7


Ex Input:
Paul got a box of 479 crayons for his birthday . At the end of the school year , he only had 134 left . How many crayons had been lost or given away ?

Ex Output:

345