class Father {
    int field;

    int method(int f) {
        if (f > 0 && f < 10) {
            f = f - 3;
            return method(f);
        }
		return f;
    }
}

class Child extends Father {
    void start() {
        class Father p;

        p = this;
        p.field = 5;
        p = null;

        Print(this.field);
    }
}

class Main {
	static void main() {
	}
}