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