public class jjcc {
    public static void main(String[] args)
    {
        System.out.println(add(1,2));
        System.out.println(sub(1,2));
        System.out.println(mul(1,2));
        System.out.println(div(1,2));
    }
    public static double add(double a,double b)
    {
        return a+b;
    }
    public static double sub(double a,double b)
    {
        return a-b;
    }
    public static double mul(double a,double b)
    {
        return a*b;
    }
    public static double div(double a,double b)
    {
        return (double)a/b;
    }
}