#ifndef TH   //This is not C++ code, just a model to copy and paste.
#define TH
#include <iostream>   //for ostream and istream
#include <cstddef>    //for size_t
using namespace std;

class T {
public:
	T& operator=(const T& another);

	T& operator+=(int i);
	T& operator-=(int i);

	operator int() const;

	friend bool operator==(const T& t1, const T& t2);
	friend bool operator< (const T& t1, const T& t2);
	friend bool operator<=(const T& t1, const T& t2);
	friend int  operator- (const T& t1, const T& t2);

	int& operator[](size_t i);
	const int& operator[](size_t i) const;

	friend ostream& operator<<(ostream& ost, const T& t);
	friend istream& operator>>(istream& ist,       T& t);
};

inline bool operator!=(const T& t1, const T& t2) {return !(t1 == t2);}
inline bool operator> (const T& t1, const T& t2) {return t2 < t1;}
inline bool operator>=(const T& t1, const T& t2) {return t2 <= t1;}

inline const T operator-(T t, int i) {return t -= i;}
inline const T operator+(T t, int i) {return t += i;}
inline const T operator+(int i, T t) {return t += i;}

inline T& operator++(T& t) {return t += 1;}
inline T& operator--(T& t) {return t -= 1;}

inline const T operator++(T& t, int) {const T old = t; ++t; return old;}
inline const T operator--(T& t, int) {const T old = t; --t; return old;}
#endif