You are given a math word problem and you are supposed to apply multiple mathematical operators 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.

Ex Input:
at the store beef jerky was $ 34.23 for 3 pounds . if you bought 7 pounds how much would it cost ?

Ex Output:
79.87


Ex Input:
there are 30 students in a class . if the teacher put them into groups with 5 students in each group how many groups would she have ?

Ex Output:
6


Ex Input:
at lunch a waiter had 10 customers and 5 of them did n't leave a tip . if he got $ 3 each from the 1 who did tip how much money did he earn ?

Ex Output:

15