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:
Brad has 17 balloons . 8 balloons are red and the rest are green . How many green balloons does Brad have ?

Ex Output:
9

Ex Input:
Tom has 30 violet balloons , he gave Fred 16 of the balloons . How many violet balloons does he now have ?

Ex Output:
14

Ex Input:
Sara grew 43 pumpkins , but the rabbits ate 23 pumpkins . How many pumpkins does Sara have left ?

Ex Output:
20