CF204A Little Elephant and Interval
Description
The Little Elephant very much loves sums on intervals.
This time he has a pair of integers $ l $ and $ r $ $ (l
Input Format
The single line contains a pair of integers $ l $ and $ r $ $ (1
Output Format
On a single line print a single integer — the answer to the problem.
Explanation/Hint
In the first sample the answer includes integers 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44.