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.

Input: Consider Input: he wanted to make sure that he is protected from the cold evenings in the forest so he decided to build a fireplace made of cement . if he bought 215 lbs of cement and his son brought another 137 lbs how much cement did he have originally if he now has 450 lbs ?

Output: 98

Input: Consider Input: every day ryan spends 4 hours on learning english and 3 hours on learning chinese . how many hours does he spend on learning english and chinese in all ?

Output: 7

Input: Consider Input: a store had 40 oranges in a bin . if they threw away 25 of the old 1 and put 21 new 1 in the bin how many would be in the bin ?
Output: 36