题解 | #等差数列#
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
while True:
try:
n = int(input())
'''
# 方法一
i, lst = -1, []
for _ in range(n):
i += 3
lst.append(i)
print(sum(lst))
'''
# 方法二
Sum, i = 0, 2
while n > 0:
Sum += i
i += 3
n -= 1
print(Sum)
except:
break
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