#include<iostream>

using namespace std;

class forma_geo
{
protected:
    int raza;


public:
    void set_raza(int r)
    {
        raza = r;
    }


};

class cost
{
public:
    float calcul(float aria)
    {
        return (aria*350);
    }
};

class cerc: public forma_geo, public cost
{
public:
    float get_aria()
    {
        return(raza*raza* 3.14);
    }
};

int main ()
{ cerc c1;
 int r;
  cout <<"Introduce ti raza: "; cin >> r;
  c1.set_raza(r);
cout<<"\nAria formei geometrice este "<<c1.get_aria()<<endl;
cout<<"Costul total este "<<c1.calcul(c1.get_aria())<<endl;

return 0;
}