#include<iostream>;
#include <cmath>;


using namespace std;

class Point {
	//данные

	public: 
		double x, y;

		template <class value_class> Point(value_class ax, value_class ay);
		Point();

		//функции

		const double calc_distance(const Point& p);
		friend istream& operator >>(istream& is,Point a);
		friend ostream& operator <<(ostream& os,Point a);
};

template<class value_class>
inline Point::Point(value_class ax, value_class ay)
{
	x = (double)(ax);
	y = (double)(ay);
}