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求和*
Time Limit: 1 Second(s) Memory Limit: 32 MB
Total Submission(s): 2502 Accepted Submission(s): 1844
Problem Description
求[1,n]之和。
Input
输入一个正整数n。
本题只有一组测试!
Output
输出1+2+……+n之和。
Sample Input
3
Sample Output
6
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