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:
George had 30 dollars . For his birthday he got 16 more dollars but spent 38 on a new game . How much money does he have now ?

Ex Output:
8

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:
In fourth grade there were 35 students at the start of the year . During the year 10 students left and 10 new students came to school . How many students were in fourth grade at the end ?

Ex Output:
35