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:
A dust storm sweeps across the prairie . It covers 64535 acres of the prairie in dust , but leaves 522 acres untouched . How many acres does the prairie cover ?

Ex Output:
65057


Ex Input:
There were 105 parents in the program and 698 pupils , too . How many people were present in the program ?

Ex Output:
803


Ex Input:
Roden went to a pet shop . He bought 15 gold fish and 7 blue fish . How many fish did he buy ?

Ex Output:

22