#include<iostream>
using namespace std;

class shape
{
    public:
    int area;
    void calc()
    {
        cout<<sizeof(*this)<<"\n";
    }
};
class triangle: public shape
{
    public:
    int side1,side2,side3;
};
class square: public shape
{
    public:
        int side1;
};
main()
{
    shape *s;
    triangle t;
    square sq;
    s=&t;
    s->calc();
    s=&sq;
    s->calc();
}