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Sep 22nd, 2019
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  1. n = int(input())
  2. x = float(input())
  3.  
  4. sum = float(input()) * x
  5. i = 1
  6. while i < n:
  7. sum = (sum + float(input())) * x
  8. i = i + 1
  9. sum = sum + float(input())
  10.  
  11. print(sum)
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