





def     SCREAMING_SNAKE_CASE			(      lowerCAmelCase = 1_000					):
       return sum(2 * a * ((a - 1) // 2) for a in range(3    ,       n + 1					)					)


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













def     SCREAMING_SNAKE_CASE			(      lowerCAmelCase = 1_000					):
       _UpperCamelCase              =						3
       _UpperCamelCase              =						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() = }''')






