Guard Flamingos

You decide to add a pink flamingo lawn ornament every 2 feet around the perimeter of your yard. How many flamingos do you need to purchase?

Task

Given the length and width of your rectangular yard, determine how many flamingos your should buy to put one every 2 feet along the edges of your yard.

Input Format

Two integer values that represent the length and width of your front yard.

Output Format

An integer that represents the total number of flamingos that you should purchase.

Sample Input

10
10

Sample Output

20

Explanation

The perimeter of your yard is 40 feet long. You will need 20 flamingos to place one every 2 feet.

Solutions

Language	Solution
C	not available
CPP	not available
C#	not available
Python	available
Java	not available
Ruby	not available
Swift	not available