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.

Input: Consider Input: A book store had 41 books in the bargin bin . If they sold 33 books , but then put 2 more in the bin , how many books would be in the bin ?

Output: 10


Input: Consider Input: A waiter at ' The Greasy Spoon ' restaurant had 29 customers to wait on . During the lunch rush he added another 20 customers . If 34 of the customers did n't leave him a tip , how many customers did leave a tip ?

Output: 15


Input: Consider Input: Kendra made punch for her friend 's birthday party . She used 0.25 gallon of grape juice , 0.375 gallon of cranberry juice , and 0.125 gallon of club soda . How many gallons of punch did Kendra make ?


Output: 0.75