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# Sum Problem

500ms 32768K

## Description:

Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge).

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

## Input:

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

## Output:

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.

## Sample Input:

1
100

## Sample Output:

1

5050

Info

Provider HDU

Origin HDU1001

Code HDU1001

Tags

Submitted 67

Passed 16

AC Rate 23.88%

Date 06/03/2019 16:17:31

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