问题 1009. -- sum of all integer numbers

1009: sum of all integer numbers

时间限制: 1 Sec  内存限制: 64 MB
提交: 2  解决: 2
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题目描述

Your task is to find the sum of all integer numbers lying between 1 and N inclusive.

输入 [sumofallin.in]

There are multiple test cases.
The input consists of a single integer N that is not greater than 10000 by it's absolute value.

输出 [sumofallin.out]

Write a single integer number that is the sum of all integer numbers lying between 1 and N inclusive.

样例输入

3

样例输出

6

提示

标签

小菜鸟 ural

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