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# n = int(input('请输入整数:'))
# sum_he = 0
# for i in range(n + 1):
# sum_he += i
# print(sum_he)
# def sum_n(n):
# if n == 1:
# return 1
# else:
# return n + sum_n(n-1)
# print(sum_n(5))
# print(sum_n(100))
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