//multi.Java
class A
{
        int i,j;
public A(int i,int j)
{
        this.i=i;
        this.j=j;
}
int add(){
        return i+j;
}
} 
class B extends A
{
        public B(int i,int j)
        {	
                super(i,j);
        }
        int multiply(){
                return 0;
        }
}
class C extends B
{
        C(int i,int j)
        {
                super(i,j);
        }
        int multiply()
        {
                return i*j;
        }
}
public class multi
{
        public static void main(String args[]){
                B a=new C(5,6);	
System.out.println("i*j＝"+a.multiply());
System.out.println("i+j＝"+a.add());	
}
}