//=================================================================//
class AClass {
	// MAIN PROGRAM
	// What's the output of this program
	public static void main( String[] args)	{
		BClass b = new BClass();
		AClass a = new AClass(3);
		
		System.out.println("Result of a.F1(5) = "+a.F1(5)+" and a.F2(b, 5) = "+a.F2(b, 5));

		ASubClass asub = new ASubClass();
		
		System.out.println("Result of asub.F1(5) = "+asub.F1(5)+" and asub.F2(b, 5) = "+asub.F2(b, 5));
		
	}
//	========================== SuperClass ==========================//
	int f;
	
	AClass(int f){
    	this.f = f;
    }
    int F1(int x){
		return f * x;
	}
	int F2(BClass bObject, int x){
		return f * bObject.F(x);
	}

}
//========================== SubClass =============================//
class ASubClass extends AClass{

	ASubClass(){
    	super(4);
    }
	
    int F2(BClass bObject, int x){
		return bObject.F(f) * x;
	}
}
//========================== ClassB =============================//
class BClass {
	
    public BClass(){
    }
    
	int F(int x) {
		return x + 2;
	}
}