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:
Paul made 68 dollars mowing lawns and 13 dollars weed eating . If he only spent 9 dollar a week , how long would the money last him ?

Ex Output:
9


Ex Input:
Roadster 's Paving Company used 10 tons of cement to pave Lexi 's street and 5.1 tons of cement to pave Tess 's street . How much cement did Roadster 's Paving Company use in all ?

Ex Output:
15.1


Ex Input:
Sam had 7 pennies and 8 dimes in his bank . His sister borrowed 4 dimes . How many dimes does Sam have now ?

Ex Output:

4