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- a = int(input())
- b = int(input())
- if a % 2 == 1 and b % 2 == 1:
- print(((b-a)//2)-b)
- elif a % 2 == 0 and b % 2 ==1:
- print(-1*((b-a+1)//2))
- elif a % 2 == 0 and b % 2 == 0:
- print(-1*((b-a)//2)+b)
- else:
- print((b-a+1)//2)
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