def module4_sub(n1, n2, n3):
    return n1 - n2 - n3


class ClassInModule4:
    @staticmethod
    def sub(n1, n2, n3):
        return n1 - n2 - n3 - 2

def module4_sub(n1, n2, n3):
    return n1 - n2 - n3


class ClassInModule4:
    @staticmethod
    def sub(n1, n2, n3):
        return n1 - n2 - n3 - 2
