
    Write a function that calculates the total boundary length of a square isolation zone around a patient's bed, given the length of one side of the zone in centimeters as input. The boundary length will be used to determine the amount of safety barrier tape needed to mark the isolation perimeter for medical staff and equipment positioning.
    

    
def square_perimeter(a):
    """
    Write a function that calculates the total boundary length of a square isolation zone around a patient's bed, given the length of one side of the zone in centimeters as input. The boundary length will be used to determine the amount of safety barrier tape needed to mark the isolation perimeter for medical staff and equipment positioning.
    

    """
def square_perimeter(a):
    """
    Write a function that calculates the total boundary length of a square isolation zone around a patient's bed, given the length of one side of the zone in centimeters as input. The boundary length will be used to determine the amount of safety barrier tape needed to mark the isolation perimeter for medical staff and equipment positioning.
    

    """
    perimeter = 4 * a
    return perimeter