问题1350--Sum Problem

1350: Sum Problem

时间限制: 1 Sec  内存限制: 128 MB
提交: 465  解决: 195
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题目描述
Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge).

In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n.

输入
The input will consist of a series of integers n, one integer per line.

输出
For each case, output SUM(n) in one line, followed by a blank line. You may assume the result will be in the range of 32-bit signed integer.

样例输入 Copy
1
100
样例输出 Copy
1

5050

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