Reign year of Chakri dynasty, Thailand

def reign_year_to_ad(reign_year: int, reign: int) -> int:
    """
    Reign year of Chakri dynasty, Thailand
    """
    if int(reign) == 10:
        ad = int(reign_year) + 2015
    elif int(reign) == 9:
        ad = int(reign_year) + 1945
    elif int(reign) == 8:
        ad = int(reign_year) + 1928
    elif int(reign) == 7:
        ad = int(reign_year) + 1924
    return ad