Nether Realms w/o regex

// Nether Realms w/o using regex, just parsing the string
// Programming Fundamentals Exam - Part 2 - 23 October 2016
// https://judge.softuni.bg/Contests/Practice/Index/349#0
// 100 / 100
// Memory: 9.30 MB
// Time: 0.015 s

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace NetherRealms
{
    class Program
    {
        static void Main()
        {
            string[] separators = { " ", "," };
            List<string> demons = Console.ReadLine()
                                  .Split(separators, StringSplitOptions.RemoveEmptyEntries)
                                  .ToList();

            demons.Sort();

            foreach (string demon in demons)
                ParseDemonInfo(demon);
        }

        private static void ParseDemonInfo(string s)
        {
            int health = 0,
                multCount = 0,
                divCount = 0;

            StringBuilder sb = new StringBuilder();

            foreach (char ch in s)
                switch (ch)
                {
                    case '*':
                        multCount++;
                        sb.Append(' ');
                        break;
                    case '/':
                        divCount++;
                        sb.Append(' ');
                        break;
                    case '+':
                    case '-':
                        sb.Append(' ');
                        sb.Append(ch);
                        break;
                    default:
                        if (char.IsDigit(ch) || ch.Equals('.'))
                            sb.Append(ch);
                        else
                        {
                            health += ch;
                            sb.Append(' ');
                        }
                        break;
                }

            double damage = sb.ToString()
                            .Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                            .Select(double.Parse)
                            .ToArray()
                            .Sum();

            damage *= Math.Pow(2, multCount - divCount);

            Console.WriteLine($"{s} - {health} health, {damage:F2} damage");
        }

    }
}