Definition: 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: rob is very fond of tall structures . he likes collecting pictures and comparing them . 2 of his favorite buildings are chicago 's sears tower and dubai 's burj khalifa . if burj khalifa stands at 830 meters high and sears stands at 527 meters high how much higher is burj khalifa than sears ?
Output:
303