21 lines
286 B
Python
21 lines
286 B
Python
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a={"h","j","e"}
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a.add("e")
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print(a)
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"""
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intersection:相交
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differece:差别
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union:同盟，联合，并集
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symmetric_differece():表示对称差集
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disjoint:不相交的
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subset:子集，分组
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superset:父集，超集
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"""
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a=int(input())
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s=0
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for i in range(1,a+1):
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s+=i
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print(s)
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