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:
Olivia and her mom were picking carrots from their garden . Olivia picked 20 and her mother picked 14 . If only 19 of the carrots were good , how many bad carrots did they have ?

Ex Output:
15


Ex Input:
While on vacation , Nancy took 49 pictures at the zoo and 8 at the museum . If she later deleted 38 of the pictures , how many pictures from her vacation did she still have ?

Ex Output:
19


Ex Input:
Zoe had 15 songs on her mp3 player . If she deleted 8 old songs from it and then added 50 new songs , how many songs does she have on her mp3 player ?

Ex Output:

57