public class Main {


    public static void main(String[] args) {
        RationalFraction r1 = new RationalFraction(1, -2);
        System.out.println("1 = " + r1);

        RationalFraction r2 = new RationalFraction(1, 3);
        System.out.println("2 = " + r2);

        RationalFraction r3 = r1.add(r2);
        System.out.println("3 = 1+2 = " + r3);

        RationalFraction r4 = r3.sub(r1);
        System.out.println("4 = 3-1 = " + r4);

        r4.sub2(r1);
        System.out.println("4 = 4-1 = " + r4);

        r3.add2(r2);
        System.out.println("3 = 3+2 = " + r3);

        RationalFraction r5 = r1.mult(r2);
        System.out.println("5 = 1*2 = " + r5);

        r3.mult2(r1);
        System.out.println("3 = 3*1 = " + r3);

        r3.div2(r1);
        System.out.println("3 = 3/1 = " + r3);

        RationalFraction r6 = r3.div(r1);
        System.out.println("6 = 3/1 = " + r6);

        System.out.println("1 = "+r1.value());

        System.out.println("целая часть 1 = "+r1.numberPart());
        RationalFraction r7 = new RationalFraction(-1,2);
        System.out.println("7 = "+r7);
        System.out.println("7 == 1? "+ r1.equals(r7));
    }
}


public class RationalFraction {
    int chisl, znam;

    public RationalFraction() {
        chisl = 0;
        znam = 1;
    }

    public RationalFraction(int c, int z) {
        chisl = c;
        znam = z;
        reduce();
    }

    int gcd(int a, int b) {
        while (a != 0) {
            b %= a;
            int t = b;
            b = a;
            a = t;
        }
        return b;
    }

    void reduce() {
        int g = gcd(chisl, znam);
        chisl /= g;
        znam /= g;
        if (znam < 0) {
            znam *= -1;
            chisl *= -1;
        }
    }

    public RationalFraction add(RationalFraction r) {
        int obshznam = r.znam * znam;
        int newchisl = chisl * r.znam + r.chisl * znam;
        RationalFraction ans = new RationalFraction(newchisl, obshznam);
        ans.reduce();
        return ans;
    }

    public void add2(RationalFraction r) {
        chisl *= r.znam;
        chisl += znam * r.chisl;
        znam *= r.znam;
        reduce();
    }

    public RationalFraction sub(RationalFraction r) {
        int obshznam = r.znam * znam;
        int newchisl = chisl * r.znam - r.chisl * znam;
        RationalFraction ans = new RationalFraction(newchisl, obshznam);
        ans.reduce();
        return ans;
    }

    public void sub2(RationalFraction r) {
        chisl *= r.znam;
        chisl -= znam * r.chisl;
        znam *= r.znam;
        reduce();
    }

    public RationalFraction mult(RationalFraction r) {
        RationalFraction ans = new RationalFraction(chisl * r.chisl, znam * r.znam);
        ans.reduce();
        return ans;
    }

    public void mult2(RationalFraction r) {
        chisl *= r.chisl;
        znam *= r.znam;
        reduce();
    }

    public RationalFraction div(RationalFraction r) {
        return mult(new RationalFraction(r.znam, r.chisl));
    }

    public void div2(RationalFraction r) {
        mult2(new RationalFraction(r.znam, r.chisl));
    }


    public String toString() {
        return chisl + "/" + znam;
    }

    public double value() {
        return 1.0 * chisl / znam;
    }

    public boolean equals(RationalFraction r) {
        return r.chisl == chisl && r.znam == znam;
    }

    public int numberPart() {
        return chisl / znam;
    }
}