你的任务是要得出所有1到N之间整数的和.（包括1和N）
输入
输入由单整数N组成,N的绝对值不大于10000.
输出
在输出文件中写出表示所有1到n之间整数之和的单整数.
英语翻译Your task is to find the sum of all integer numbers lyin
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