#include<iostream>
using namespace std;
class geometry
{
public:
static double area(double h, double w)
{
return h * w;
}
static double area(double r)
{
return r * r * 3.14;
}
};
int main()
{
double rectangle_area = geometry().area(3, 4);
double circle_area = geometry().area(5);
cout << rectangle_area << endl;
cout << circle_area << endl;
return 0;
}