BonusScore

using System;

namespace BonusScore

{
    class BonusScore
    {
        static void Main()
        {
            double BonusScores = 0;
            double NewBonusScores = 0;
            Console.Write("Enter score: ");
            int score = int.Parse(Console.ReadLine());
            if (score <= 100)
            {
                BonusScores = 5;
            }
            else
            if ((score > 100) && (score <= 1000))
            {
                BonusScores = 0.2 * score;
            }
            else
            if (score > 1000)
            {
                BonusScores = 0.1 * score;
            }
            if (score % 2 == 0)
            {
                NewBonusScores = BonusScores + 1;
                Console.WriteLine("Bonus score: " + NewBonusScores);
                Console.WriteLine("Total score: " + (score + NewBonusScores));
            }
            else
            {
                int a = score % 5;
                if ((a == 0) || ((a == 0) && (!(a % 2 == 0))))
                {
                   NewBonusScores = BonusScores + 2;
                   Console.WriteLine("Bonus score: " + NewBonusScores);
                   Console.WriteLine("Total score: " + (score + NewBonusScores));
                }
                if (!((a == 0) || ((a == 0) && (!(a % 2 == 0)))))
                {
                    Console.WriteLine("Bonus score: " + BonusScores);
                    Console.WriteLine("Total score: " + (score + BonusScores));
                }
            }
        }
    }
}