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LilChicha174

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LilChicha174
Mar 23rd, 2022
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  1. a1 = int(input())
  2. a2 = int(input())
  3. a3 = int(input())
  4. if (a3 - a2) == (a2 - a1):
  5.     print("YES")
  6. else:
  7.     print("NO")
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