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

Input: Consider Input: At the fair there were 9 people in line for the bumper cars . If 6 of them got tired of waiting and left and 3 more got in line , how many people would be in line ?

Output: 6


Input: Consider Input: 29 birds were sitting in a tree . Some more fly up to the tree . Then there were 42 birds in the tree . How many more flew up to the tree ?

Output: 13


Input: Consider Input: Wanda has 4 blocks . Theresa gives Wanda 79 more . How many blocks does Wanda have in all ?


Output: 83