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.
Example: robin bought 11 sodas for her and her friends . if they only drank 3 of them how many extras did she have ?
Example solution: 8
Example explanation: Extra sodas is total - drank = 11-3 = 8

Problem: to make sure that the cake is sweet he needs 450 lbs . of sugar . if he has 287 lbs . of sugar stored in his house how much additional sugar will he need ?
Solution: 163