// Fraction.h

#include <iostream>
//#include <cstdlib>

/*
namespace ecci
{
*/

class Fraction
{
  private:
	long long numerator = 0;
	long long denominator = 1;

  public:
	/// Default constructor, conversion constructor
	Fraction(long long numerator = 0, long long denominator = 1)
	    : numerator(numerator)
	    , denominator(denominator)
	{
		simplify();
	}

	void read();

	void print() const
	{
		std::cout << numerator << '/' << denominator;
	}

	bool simplify();

	long long gcd()
	{
		return gcd(numerator, denominator);
	}

	// greatest common divisor
	static long long gcd(long long a, long long b);

	Fraction add(const Fraction& other) const;
};


// main.cpp

int main()
{
	Fraction fr1;
	fr1.read();
	std::cout << "fr1 = ";
	fr1.print();

	Fraction fr2;
	std::cout << "\nfr2 = ";
	fr2.print();

	Fraction fr3( 2, 3 );
	std::cout << "\nfr3 = ";
	fr3.print();

	Fraction fr4( -5 );
	std::cout << "\nfr4 = ";
	fr4.print();

	Fraction fr5 = -13;
	std::cout << "\nfr5 = ";
	fr5.print();

	Fraction fr6 = Fraction(-13);
	std::cout << "\nfr6 = ";
	fr6.print();

	Fraction fr7;
	fr7 = 27;
	std::cout << "\nfr7 = ";
	fr7.print();

	Fraction sum = fr1.add(fr3);
	std::cout << "\nfr1 + fr3 = ";
	sum.print();

	std::cout << std::endl;
}

// Fraction.cpp

void Fraction::read()
{
	std::cin >> numerator >> denominator;
	simplify();
}

bool Fraction::simplify()
{
	long long common = gcd();
	numerator /= common;
	denominator /= common;
/*
	if ( denominator < 0 )
	{
		numerator *= -1;
		denominator *= -1;
	}
*/
	return common > 1;
}

long long Fraction::gcd(long long a, long long b)
{
	a = a >= 0 ? a : -a;
	b = b >= 0 ? b : -b;

	while ( b > 0 )
	{
		long long t = b;
		b = a % b;
		a = t;
	}
	return a;
}

Fraction Fraction::add(const Fraction& other) const
{
	return Fraction(
	    this->numerator * other.denominator + denominator * other.numerator
	    , denominator * other.denominator);
}


// } // namespace ecci