# coding: utf-8
class Solution:
def sum(self, n):
"""求1 + 2 + 3 +...+ n"""
return sum(range(1, n+1))
if __name__ == '__main__':
obj = Solution()
s = obj.sum(100)
print(s)
# coding: utf-8
class Solution:
def sum(self, n):
"""求1 + 2 + 3 +...+ n"""
return sum(range(1, n+1))
if __name__ == '__main__':
obj = Solution()
s = obj.sum(100)
print(s)