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:
Billy has 62 crayons . 52 are eaten by a hippopotamus . How many crayons will Billy have ?

Ex Output:
10


Ex Input:
Mark has 13 trees in his backyard . If he plants 12 more , how many trees will he have ?

Ex Output:
25


Ex Input:
Darius drove 679 miles to visit his grandmother . Julia drove 998 miles to visit her grandmother . What is the total number of miles Darius and Julia drove ?

Ex Output:

1677