def METHOD_NAME(self, number, forms):
    if number % 100 < 10 or number % 100 > 20:
        if number % 10 == 1:
            form = 0
        elif 1 < number % 10 < 5:
            form = 1
        else:
            form = 2
    else:
        form = 2
    return forms[form]