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#41262: python


suyueh (suyueh)

a042. 平面圓形切割 -- 許介彥 | From: [125.229.229.84] | 發表日期: 2024-07-15 16:52
while True:  
  try:
    a=int(input())
    print(a*a-a+2)
  except:
    break
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