Python题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n = int(input()) print(int(2 * n + n * (n - 1) * 3 / 2))
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n = int(input()) print(int(2 * n + n * (n - 1) * 3 / 2))
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