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51033 - Sum of the series

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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Question by Ibrahim Mesecan.

Sum of the series

Question: In mathematics, sum of the series from 1 to n can be calculated by Equation 1.

From this formula sum of the numbers from a to b can be derived as in Equation 2. Write a program that is going to get two numbers a and b, then the program is going to calculate sum of the series from a to b.

Input specification: You will be given 2 integers (a and b) where 0 ≤ (a and b) ≤ 50,000.

Output specification: Show one number, sum of the numbers from a to b.

Sample Input I `5 10`	Sample Input II `1 10000`
Sample Output I `45`	Sample Output II `50005000`

Explanation: To calculate sum of the numbers from 5 to 10, first sum of the numbers from 1 to 10 (55) and sum of the numbers from 1 to 4 (10) are calculated.
Then, 55 - 10 = 45.

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