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: Beka flew 873 miles to visit her aunt . Jackson flew 563 miles to visit his aunt . How many more miles did Beka fly than Jackson ?

Output: 310


Input: Consider Input: Brian ’ s car gets 20 miles per gallon . On his last trip , he used 3 gallons of gas . How many miles did he travel on his last trip ?

Output: 60


Input: Consider Input: If Heather bicycled 40 kilometers at 8 kilometers per hour , how long was Heather bicycling ?


Output: 5