题解 | #小乐乐求和#
小乐乐求和
https://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
n = int(input()) Sn = (n+n*n) / 2 print(int(Sn))#题解#
小乐乐求和
https://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
n = int(input()) Sn = (n+n*n) / 2 print(int(Sn))#题解#
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