A Loop Problem

Points: 3

Time limit: 0.2s

Memory limit: 64M

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Problem type

Dereck is learning for loops but doesn't know what a keyboard is. Can you help him?

Given $L$ ~L~ and $R$ ~R~, output the sum of all integer numbers between $L$ ~L~ and $R$ ~R~ (inclusive).

The first line will contain the integers $L$ ~L~ and $R$ ~R~ ( $0\ <\ L\ \le\ R\ \le\ 2^{31}-1$ ~0\ <\ L\ \le\ R\ \le\ 2^{31}-1~).

Output the sum of all integer numbers between $L$ ~L~ and $R$ ~R~ (inclusive).

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