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.

Example Input: Shelby ’ s teacher gives out gold stars for great math work . Yesterday , Shelby earned 4 gold stars . Today , she earned 3 more . How many gold stars did Shelby earn in all ?
Example Output: 7

Example Input: Last year , 90171 people were born in a country , and 16320 people immigrated to it . How many new people began living in the country last year ?
Example Output: 106491

Example Input: Lisa starts with 91 bananas . Maria gives Lisa 8 more . How many bananas does Lisa end with ?
Example Output:
99