def roman_to_int(roman_numeral: str, overline_code: str='̅') ->int:
    """
    Recursive function which returns arabic numeral (int), given roman numeral (string)

    #>>> roman_to_int('N')
    #0
    #>>> roman_to_int('MMMCMXCIX')
    #'3999'
    #>>> roman_to_int('MV̅')
    #4000
    #>>> int_to_roman('MV^', overline_code='^')
    #4000
    """
    pass
