BonusScore

using System;
//Write a program that applies bonus score to given score in the range
//[1…9] by the following rules:
//•	If the score is between 1 and 3, the program multiplies it by 10.
//•	If the score is between 4 and 6, the program multiplies it by 100.
//•	If the score is between 7 and 9, the program multiplies it by 1000.
//•	If the score is 0 or more than 9, the program prints “invalid score”.
//Examples:
//score	result
//2	20
//4	400

class BonusPoints
{
    static void Main()
    {
        int score = int.Parse(Console.ReadLine());
        int bonusScore = 0;
       if (score>=1 && score<=9)
	{
        if (score >= 1 && score <= 3)
        {
            bonusScore = score * 10;
            Console.WriteLine(bonusScore);
        }
        else if (score >= 4 && score <= 6)
        {
            bonusScore = score * 100;
            Console.WriteLine(bonusScore);
        }
        else if (score >= 7 && score <= 9)
        {
            bonusScore = score * 1000;
            Console.WriteLine(bonusScore);
        }
	}
       else
       {
           Console.WriteLine("Invaid score!");
       }
    }
}