input: 
  from typing import List
  
  
  def find_total_surfacearea(dimensions: List[int]) -> int:
      """ Calculate the total surface area of a cuboid given its three dimensions.
      >>> find_total_surfacearea([2, 3, 4])
      52
      """
  
output:     l, w, h = dimensions
      return 2 * (l * w + w * h + h * l)