package kolos1;

public class Kolos1 {
    public static void main(String[] args) {
        B b = new B();
        System.out.println(b.random());

        C c = new C(20);
        System.out.println(c.random());

        F f = new F();

        System.out.println(f.sum(15, 20.5));
        System.out.println(f.sum(15.7, 20));

        E e = new E()
        {
            public double sum(int x, double y)
            {
                return x + y;
            }
        };
        System.out.println(e.sum(100, 2.15));
    }

}

abstract class A
{
    abstract int random();
}

class B extends A
{
    int random()
    {
        return (int)(Math.random()*1000);
    }
}

class C extends A
{
    int max;
    C(int max)
    {
        this.max = max;
    }
    int random()
    {
        return (int)(Math.random()*(max+1));
    }
}

interface D extends E
{
    double sum(double x, int y);
}

interface E
{
    double sum(int x, double y);
}

class F implements D
{
    public double sum(double x, int y)
    {
        return sum(y, x);
    }

    public double sum(int x, double y)
    {
        return x + y;
    }
}