#ifndef GATESH
#define GATESH
#include <iostream>
using namespace std;

class gates {
public:
	class bill;       //declaration for class gates::bill
};

class gates::bill {   //definition for class gates::bill
	double d;
public:
	bill(double initial_d): d(initial_d) {}
	void g() const {cout << d << "\n";}
};
#endif