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.

Input: Consider Input: 13 ducks are swimming in a lake . 20 more ducks come to join them . How many ducks are swimming in the lake ?

Output: 33


Input: Consider Input: Tina has 82 bananas . She gets 3 more from Joyce . How many bananas does Tina have in all ?

Output: 85


Input: Consider Input: Sara has 792 black and 122 red marbles . Fred took 233 of Sara 's black marbles . How many black marbles does Sara now have ?


Output: 559