You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Ex Input:
Jason has 3 Pokemon cards . Benny bought 2 of Jason 's Pokemon cards . How many Pokemon cards does Jason have now ?

Ex Output:
1


Ex Input:
A restaurant served 4 pies during lunch and 9 during dinner today . The restaurant served 7 pies and 2 pizzas yesterday . How many pies were served in total ?

Ex Output:
20


Ex Input:
Joan found 70 seashells on the beach . she gave Sam some of her seashells . She has 27 seashell . How many seashells did she give to Sam ?

Ex Output:

43