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: Heather weighs 87 pounds . Emily weighs 9 pounds . Elizabeth weighs 8 pounds . How much heavier is Heather than Emily ?

Output: 78

Input: Consider Input: Joyce starts with 75 apples . She gives 52 to Larry . How many apples does Joyce end with ?

Output: 23

Input: Consider Input: 22 boys went down the slide . 13 more boys went down the slide . How many boys went down the slide ?
Output: 35