#5BonusScore

using System;

class BonusScore
{
    static void Main()
    {
        Console.WriteLine("Enter user score in the range [0...9].");
        int userScore = int.Parse(Console.ReadLine());
        if (userScore >= 1 && userScore <= 3)
        {
            Console.WriteLine("Bonus score: {0}", userScore*10);
        }
        else if (userScore >= 4 && userScore <= 6)
        {
            Console.WriteLine("Bonus score: {0}", userScore * 100);
        }
        else if (userScore >= 7 && userScore <= 9)
        {
            Console.WriteLine("Bonus score: {0}", userScore * 1000);
        }
        else
        {
            Console.WriteLine("Invalid score!");
        }
    }
}