#include<iostream>

using namespace std;

class opor
{
public:
	double r;
	opor(void);
	opor(double x);
};

opor::opor(void){

	r = 0;
}

opor::opor(double x){

	r = x;

}

opor operator+ (opor x, opor y){
	opor suma;
	suma.r =  x.r + y.r;	
	return suma;
}

opor operator* (opor x, opor y){
	opor suma;
	suma.r = 1.0/(1.0/x.r + 1.0/y.r);
	return suma;	
}

ostream& operator<< (ostream& srt, opor& x){
	
	srt << x.r;
	return srt;
}


int main(int argc, char **argv)
{
	opor r1(2), r2(2);
	opor r3;
	r3 = (r1 + r2) * (r1 * r2);

	cout << r3  << endl;

    return 0;
}