using System;

​

public class Program

{

    public static void Main()

    {

        double hitpoints = 200;

        double constHitpoints = 200;

        double damageBarrel = 250;

        double barrelArmor = 2.5;

        int i = 0;

        int wornAfter = 0;

        int damagedAfter = 0;

        int badlyDamagedAfter = 0;

        int ruinedAfter = 0;

        while (true)

        {

            //var barrelArmorModifier = hitpoints * barrelArmor; // Uncomment if using non constant for hitpoints

            var barrelArmorModifier = constHitpoints * barrelArmor; // Uncomment if using constant for hitpoints

            var damagePerShot = damageBarrel / barrelArmorModifier;

            hitpoints = hitpoints - damagePerShot;

            i++;

            Console.WriteLine($"[Shot {i}] Damage to gun: -{damagePerShot}, Gun Health: {hitpoints}");

            if (hitpoints <= 0)

            {

                break;

            }

            int damagedPercentage = (int)Math.Round((double)(100 * hitpoints) / constHitpoints);

            if (damagedPercentage == 70)

                wornAfter = i;

            if (damagedPercentage == 50)

                damagedAfter = i;

            if (damagedPercentage == 30)

                badlyDamagedAfter = i;

        }

        Console.WriteLine("Worn after: " + wornAfter);

        Console.WriteLine("Damaged after: " + damagedAfter);

        Console.WriteLine("Badly Damaged after: " + badlyDamagedAfter);

        Console.WriteLine("Is ruined. Shots to ruin: " + i);

​

    }

}