You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Example Input: mike owned 64 baseball cards . for his birthday he got 18 more . how many cards does mike have total ?
Example Output: 82

Example Input: she also tried to get to know the teachers in the school . she found out that there are 7 departments in the school and each department has 20 teachers . how many teachers are there in total ?
Example Output: 140

Example Input: shiela was into history of asia . she can read 11 pages per hour of the book entitled '' asia 's history made easy '' . if the encyclopedia has 143 pages how many hours did it take shiela to finish reading the book ?
Example Output:
13