
    Calculate the total external wall surface area of a bank's cubic vault to determine the required security monitoring coverage and insurance premiums, given the vault's side length in feet. The vault's floor and ceiling areas should not be included in this calculation as they connect to the building's structure.
    

    
def lateralsurface_cube(l):
    """
    Calculate the total external wall surface area of a bank's cubic vault to determine the required security monitoring coverage and insurance premiums, given the vault's side length in feet. The vault's floor and ceiling areas should not be included in this calculation as they connect to the building's structure.
    

    """
def lateralsurface_cube(l):
    """
    Calculate the total external wall surface area of a bank's cubic vault to determine the required security monitoring coverage and insurance premiums, given the vault's side length in feet. The vault's floor and ceiling areas should not be included in this calculation as they connect to the building's structure.
    

    """
    LSA = 4 * (l * l)
    return LSA