#include <iostream>
using namespace std;
class base
{
    public:
    int x;
};
class derived1:virtual public base
{
    public:
    int a;
};
class derived2:virtual public base
{
    public:
    int b;
};
class derived:public derived1,public derived2
{
    public:
    void mul()
    {
        cout<<" The result is : "<<x*a*b;
    }
};
int main()
{
    derived obj;
    obj.x=10;
    obj.a=10;
    obj.b=10;
    obj.mul();
    return 0;
}