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:
Nancy 's class is going on a field trip to the zoo . If each van can hold 5 people and there are 12 students and 3 adults going , how many vans will they need ?

Ex Output:
3


Ex Input:
Mary had 21 dimes and 38 pennies in her bank . Her dad borrowed 18 pennies from Mary . How many pennies does she have now ?

Ex Output:
20


Ex Input:
While shopping for music online , Faye bought 2 country albums and 3 pop albums . Each album came with a lyric sheet and had 6 songs . How many songs did Faye buy total ?

Ex Output:

30