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#21291: python 3


jerjer920813@gmail.com (YJ)

a042. 平面圓形切割 -- 許介彥 | From: [223.136.137.66] | 發表日期: 2020-05-12 18:35
try:
while True:
n = int(input())
print(n*n-n+2)
except EOFError:
pass
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