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: katie had 72 ds games and her friend had 23 games . how many do they have total ?

Output: 95

Input: Consider Input: while building the house charlie noticed that they were running out of nails so he told his father he 's going to buy some . if they still have 9 nails left and charlie bought 2 boxes of nails the big 1 containing 55 nails and the small 1 containing 31 how many nails will they have ?

Output: 95

Input: Consider Input: the zookeeper has 68 fish to feed to the penguins . 19 penguins have already gotten a fish . the zoo has 36 penguins . how many more penguins need to get a fish ?
Output: 17