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Oct 21st, 2019
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  1. a = int(input())
  2. b = int(input())
  3. if a % 2 == 1 and b % 2 == 1:
  4. print(((b-a)//2)-b)
  5. elif a % 2 == 0 and b % 2 ==1:
  6. print(-1*((b-a+1)//2))
  7. elif a % 2 == 0 and b % 2 == 0:
  8. print(-1*((b-a)//2)+b)
  9. else:
  10. print((b-a+1)//2)
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