
    Calculate the total length of medical-grade adhesive strip needed to completely seal a square biosensor patch along its edges, given the patch's side length in millimeters, to ensure proper skin contact for accurate health monitoring.
    

    
def square_perimeter(a):
    """
    Calculate the total length of medical-grade adhesive strip needed to completely seal a square biosensor patch along its edges, given the patch's side length in millimeters, to ensure proper skin contact for accurate health monitoring.
    

    """
def square_perimeter(a):
    """
    Calculate the total length of medical-grade adhesive strip needed to completely seal a square biosensor patch along its edges, given the patch's side length in millimeters, to ensure proper skin contact for accurate health monitoring.
    

    """
    perimeter = 4 * a
    return perimeter