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: Joan found 79 seashells on the beach , she gave Mike 63 of the seashells . How many seashells does she now have ?

Output: 16

Input: Consider Input: Zach scored 42 points in the football game . Ben scored 21 points . How many more points did Zach score ?

Output: 21

Input: Consider Input: If there are 7 crayons in a box and Gerald puts 6 more crayons inside , how many crayons are in the box ?
Output: 13