def formula(foyer_fiscal, period, parameters):
    """
        Déficits antérieurs
        """
    f6fa = foyer_fiscal('f6fa', period)
    f6fb = foyer_fiscal('f6fb', period)
    f6fc = foyer_fiscal('f6fc', period)
    f6fd = foyer_fiscal('f6fd', period)
    f6fe = foyer_fiscal('f6fe', period)
    f6fl = foyer_fiscal('f6fl', period)
    return f6fa + f6fb + f6fc + f6fd + f6fe + f6fl
