Problem 2 -Bonus Score

using System;

namespace BonusScore
{
    class BonusScore
    {
        static void Main()
        {
         int bonusScore = int.Parse(Console.ReadLine());
         switch (bonusScore)
             {
                 case 1:
                 case 2:
                 case 3: Console.WriteLine(bonusScore * 10); break;
                 case 4:
                 case 5:
                 case 6: Console.WriteLine(bonusScore * 100); break;
                 case 7:
                 case 8:
                 case 9: Console.WriteLine(bonusScore * 1000); break;
                 default: if ((bonusScore == 0) || (bonusScore > 9))
                 {
                     Console.WriteLine("invalid score"); ;
                 }
                 break;
            }
        }
    }
}