# Sum of integers on the interval

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Find the sum of all integers from $a$ to $b$.

## Input

Two integers $а$ and $b$, no more than $2⋅10_{9}$ by absolute value.

## Output

Print the sum of all integers from $a$ to $b$.

## Examples

Input #1

Answer #1

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