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  1. #!/usr/bin/env python3
  2.  
  3. def func(n):
  4.     n = n - 1
  5.     a = n // 3
  6.     b = n // 5
  7.     c = n // 15
  8.     return a*(3 + a*3)//2 + b*(5 + b*5)//2 - c*(15 + c*15)//2
  9.  
  10. print(func(9))
  11. print(func(10))
Success #stdin #stdout 0.02s 8736KB
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https://ideone.com/ONWaBU
language:
Python 3 (python  3.12)
created:
11 years ago
visibility:
public

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