#include <iostream>

struct Unit
{
	explicit Unit(size_t id) : _id(id){}
	size_t id() const {return _id;}
private:
	size_t _id;
};

struct Animal : Unit
{
	Animal(std::string const & name, size_t id) : Unit(id), _name(name){}
	std::string const & name() const {return _name;}
private:
	std::string _name;
};

struct Man : Unit
{
	explicit Man(size_t id) : Unit(id){}
};

struct Bear : Animal
{
	explicit Bear(size_t id) : Unit(id), Animal("bear", id){}
};

struct Pig : Animal
{
	explicit Pig(size_t id) : Unit(id), Animal("pig", id){}
};

struct ManBearPig : Man, Bear, Pig
{
	explicit ManBearPig(size_t id) : Unit(id), Man(Id), Bear(id), Pig(id) {}
};