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 Input: while playing a video game ned lost 13 lives . now he has 70 lives . how many lives did ned have at the start ?
Example Output: 83

Example Input: on the first day of the week pat had 39 stickers . pat earned 22 more during the week . how many stickers did pat have at the end of the week ?
Example Output: 61

Example Input: bianca was practicing for a marathon . to prepare she ran 8 miles the first day and 4 miles the next day . how many miles did bianca run altogether ?
Example Output:
12