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XJTU_Python_Problems
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XJTU_Python_Problems
/
codes
/
7.py
5 lines
74 B
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n
=
int
(
input
(
)
)
sum
=
0
for
i
in
range
(
n
)
:
sum
+
=
(
i
+
1
)
*
*
2
print
(
sum
)
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