You are given a math word problem and you are supposed to apply a single mathematical operator 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.

Example Input: mark has 13 trees in his backyard . if he plants 12 more how many trees will he have ?
Example Output: 25

Example Input: willie the town baker wanted to make the biggest cake their town has ever seen . first he prepared the flour . he is planning to use 501 lbs . of flour . if he has 294 lbs . of flour stored in his bakery how much more flour does he need to buy ?
Example Output: 207

Example Input: next on his list is the famous empire state building . there he learned that the building stands 1250 feet to the top floor and the antenna spire is 204 feet . how tall is the empire state building ?
Example Output:
1454