Trapezium

Time Limit: 1 sec

 

The Problem

 A Trapezium’s has two parallel side. From this two parallel sides One Side and Height is given. Other Side is 2 times of One Side.

Your task is to find the Area of Trapezium.

 

 

The Input

Input file contains a series of line. Each line contains two integer number One side of the Trapezium, A (A<=10000) and height of the Trapezium, H (H<=10000). Input is terminated by EOF.

 

The Output

For each line of input output will show the Area of Trapezium, rounded to 2 decimal points in a separate line.

 

Sample Input

10000 10000

1234 1234

333 333

 

Sample Output

150000000.00

2284134.00

166333.50

 

 

 

 

Problem Setter: Samia Safa Ahmed