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  1. n=int(input())
  2. h=0
  3.  
  4. h=list(map(int,input().strip().split()))
  5. h=h[0]
  6. w=0
  7.  
  8. w=sum(list(map(int,input().strip().split())))
  9. const=500000004
  10. w = w % (10**9+7)
  11. ans=h
  12. ans=(ans*(h+1))%(10**9+7)
  13. ans=(ans*w)%(10**9+7)
  14. ans=(ans*(w+1))%(10**9+7)
  15. ans=(ans*const)%(10**9+7)
  16. ans=(ans*const)%(10**9+7)
  17. print(ans)
Success #stdin #stdout 0.02s 9316KB
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https://ideone.com/Ta14yb
language:
Python 3 (python  3.9.5)
created:
4 years ago
visibility:
secret

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