public class p3_17
{
    public static void main(String args[])
    {
        double x=27;
        if(x<10)
            System.out.println("y="+x);
        else if(x<20)
                 System.out.println("y="+(x*x+1));
             else if(x<30)
                      System.out.println("y="+(x*x*x+x+1));
    }
}