def calculate_points(squares, s_tiles, corners):
  """Calculates the number of points based on the number of squares, s-tiles, and corners.

  Args:
    squares: The number of squares.
    s_tiles: The number of s-tiles.
    corners: The number of corners.

  Returns:
    The number of points.
  """

  # Calculate the points from squares.
  points_from_squares = squares * 2

  # Calculate the points from s-tiles.
  points_from_s_tiles = 0
  if s_tiles > 0 and corners >= 2:
    points_from_s_tiles = s_tiles * 2

  # Calculate the points from corners.
  points_from_corners = corners // 2 * 3

  # Return the total number of points.
  return points_from_squares + points_from_s_tiles + points_from_corners


def main():
  """
  The main function.
  """

  # Get the number of squares, s-tiles, and corners.
  squares, s_tiles, corners = map(int, input().split())

  # Calculate the number of points.
  points = calculate_points(squares, s_tiles, corners)

  # Print the number of points.
  print(points)


if __name__ == "__main__":
  main()