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.

Example Input: Oliver was organizing his baseball cards in a binder with 3 on each page . If he had 2 new cards and 10 old cards to put in the binder , how many pages would he use ?
Example Output: 4

Example Input: Arthur removes 4 pencils from a jar . There were originally 87 pencils in the jar . How many pencils are left in the jar ?
Example Output: 83

Example Input: On Saturday , Sara spent $ 10.62 each on 2 tickets to a movie theater . Sara also rented a movie for $ 1.59 , and bought a movie for $ 13.95 . How much money in total did Sara spend on movies ?
Example Output:
36.78