[C#-1.5.10] BonusPoints

/*  Write a program that applies bonus scores to given scores in the range [1..9]. The program reads a digit as an input. If the digit is between 1 and 3, the program multiplies it by 10; if it is between 4 and 6, multiplies it by 100; if it is between 7 and 9, multiplies it by 1000. If it is zero or if the value is not a digit, the program must report an error.
*/
using System;

class BonusPoints
{
    static void Main()
    {
        int points = int.Parse(Console.ReadLine());

        switch (points)
        {
            case 1:
            case 2:
            case 3:
                points *= 10;
                Console.WriteLine(points);
                break;
            case 4:
            case 5:
            case 6:
                points *= 100;
                Console.WriteLine(points);
                break;
            case 7:
            case 8:
            case 9:
                points *= 1000;
                Console.WriteLine(points);
                break;

            default:
                Console.WriteLine("Invalid value.");
                break;
        }

    }
}