Add The ODD

Time Limit: 1 sec

 

The Problem

AimaS loves to play with numbers. She makes an interesting summation of series. She will give you the first number and last number of the series. Your task is adding all the odd numbers of the series.

 

Example:

The first number = 1

The Last number = 10

Result = 1 + 3 + 5 + 7 + 9 = 25

 

 

The Input

The input file contains a series of line. Each line contains 2 integers first number, F (0 <= F <=100000) 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 odd numbers in a separate line.

 

Sample Input

1 10

5 15

 

Sample Output

25

60

 

 

 

 

Problem Setter: Samia Safa Ahmed