public class Fraction {

    private int numerator; //Numerator of 1st fraction
    private int denominator;
    static int count =0;

    public Fraction(int numerator, int denominator){
        if (denominator == 0)
        {
            numerator = 0;
            denominator = 1;
        }
        else if (numerator < 0 && denominator <0)
        {
            numerator = -numerator;
            denominator = -denominator;
        }
        this.numerator = numerator;
        this.denominator = denominator;
        ++count;
    }

    public int getNumerator() { return numerator; }

    public void setNumerator(int numerator) { this.numerator = numerator; }
    public int getDenominator() { return denominator; }

    public void setDenominator(int denominator)
    {
        if (denominator == 0)
        {
            numerator = 0;
            denominator = 1;
        }
        this.denominator = denominator;
    }

    public void addFraction(Fraction other)
    {
        this.numerator = this.numerator * other.denominator + other.numerator * this.denominator;
        this.denominator = this.denominator * other.denominator;
        reduceFraction();
    }

    public static Fraction sum(Fraction a, Fraction b)
    {
        Fraction temp = new Fraction(a.numerator*b.denominator + a.denominator*b.numerator,
                                    a.denominator*b.denominator);
        temp.reduceFraction();
        return temp;
    }

    @Override
    public String toString(){
        return (this.numerator + "/" + this.denominator);
    }

    private void reduceFraction()
    {
        int x = nod(numerator, denominator);
        numerator /= x;
        denominator /=x;
    }

    private static int nod(int a, int b)
    {
        while (a!=0 && b!=0)
        {
            if (a > b)
                a = a%b;
            else
                b = b%a;
        }
        return a+b;
    }
}