// TestFoo.java

class TestFoo {

    public static void main(String[] args) {

        Foo foo = new Foo();
        int x = 5;
        System.out.println(foo.f(x));
        System.out.println(x);
        System.out.println(foo.g(x));
        System.out.println(foo.g(x));
    }

}