Given the task definition, example input & output, solve the new input case.
Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.
Example: robin bought 11 sodas for her and her friends . if they only drank 3 of them how many extras did she have ?
Output: 8
Extra sodas is total - drank = 11-3 = 8

New input case for you: tommy has $ 79 . he wants to buy a $ 35 camera . he also wants to buy a $ 59 cd player . how much more money does tommy need ?
Output:
15