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    Sum Problem

    Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
    Total Submission(s): 700165    Accepted Submission(s): 177043

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

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

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

    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



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