text: """
  Problem Statement:
  If we list all the natural numbers below 10 that are multiples of 3 or 5,
  we get 3, 5, 6 and 9. The sum of these multiples is 23.
  Find the sum of all the multiples of 3 or 5 below N.
  """
  
  
  def solution(n: int = 1000) -> int:
      """Returns the sum of all the multiples of 3 or 5 below n.
  
      >>> solution(3)
      0
      >>> solution(4)
      3
      >>> solution(10)
      23
      >>> solution(600)
      83700
      """
  
      result = 0
      for i in range(n):
          if i % 3 == 0:
              result += i
          elif i % 5 == 0:
              result += i
      return result
  
  
  if __name__ == "__main__":
      print(solution(int(input().strip())))
  