#include<iostream>
using namespace std;

class stock{

	int a;

public:

	stock(int n=0);
	void show();
	stock operator+(const stock &d);
    friend stock operator+(int n,const stock &d);

};

stock operator+(int n,const stock &d){

	stock result;
	result.a=n+d.a;

	return result;
}


stock::stock(int n){

	a=n;
}

void stock::show(){

	cout<<"a is "<<a<<endl;
}

stock stock::operator +(const stock &d){

	stock result;
	result.a=a+d.a;

	return result;
}


int main(){

	stock data1(5);
	stock data2(6);

	stock data3;
	data3=data1+data2;

	data3.show();
    
	data3=20+data2;
	
	data3.show();
	return 0;


}