You are given a math word problem and you are supposed to apply a single mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report final the numerical answer.

Ex Input:
Milford Lake was originally blue because it only had 809 algae plants . Now there are 3263 algae plants , and the lake has turned green . How many more algae plants are in Milford Lake now ?

Ex Output:
2454


Ex Input:
Joan had 695 Pokemon cards , and 6 were torn . Sara bought 133 of Joan 's Pokemon cards . How many Pokemon cards does Joan have now ?

Ex Output:
562


Ex Input:
There are 1986 books in Oak Grove 's public library . In addition , there are 5106 books in its school libraries . How many books do the libraries in Oak Grove have overall ?

Ex Output:

7092