Помогите решить в Кумире

 public class Main { 
    public static void main(String[] args) { 
        double X = 0; 
        double Y = 0; 
        
        try { // checking cmd args
            if(args.length == 0) throw new IllegalArgumentException(); 
            X = Double.parseDouble(args[0]); 
        } catch(NumberFormatException e) { 
            System.err.println("Not a double number! Closing program."); 
            return; 
        } catch(IllegalArgumentException e) { 
            System.err.println("Command line arguments is empty! Closing program."); 
            return; 
        } 
         
        { // X processing part
            if(X <= -20) 
                Y = 20; 
            else if(-20 < X && X <= 30) 
                Y = Math.sqrt(X); 
            else if(X > 30) 
                Y = 30; 
        } 
         
        System.out.println("Y = " + Y); // result part
    } 
}