




def 						SCREAMING_SNAKE_CASE__ (   lowercase = 1000					)  ->       int:
   return sum(2 * a * ((a - 1) // 2) for a in range(3						,n + 1					)					)


if __name__ == "__main__":
       print(solution())











def 						SCREAMING_SNAKE_CASE__ (   lowercase = 1000					)  ->       int:
   snake_case				:    Optional[int]           =	3
   snake_case				:    List[Any]           =	0
   while a < n:
      if a % 3 == 0 or a % 5 == 0:
         result += a
      elif a % 15 == 0:
         result -= a
      a += 1
   return result


if __name__ == "__main__":
       print(f"""{solution() = }""")





