504 - Add The Even

Add The Even

Time Limit: 1 sec

**The Problem**

**AimaS** is playing with numbers again. She was thinking to make a program that add all the even numbers of the series. Can you help her with that?

Example:

The first number = 1

The Last number = 10

The series = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Result = 2 + 4 + 6 + 8 + 10 = 30

**The Input**

The input file contains a series of line. Each line contains 2 integers first number, **F (0 <= F <=1000000)** and last number, **L (F <= L)** of the series. Input is terminated by EOF.

**The Output**

For each line of input print the summation of even numbers in a separate line.

**Sample Input**

1 10

5 15

**Sample Output**

30

50

Problem Setter: Samia Safa Ahmed