100 line Keno Game in C#

Program.cs

using System;
using System.Collections;
using System.Text.RegularExpressions;

namespace KenoProject {
    class Program {
        static void Main(string[] args) {
            Random generator = new Random();
            Console.WriteLine("=======  Play Keno  =======\n\n");
            while (true) {
                Console.Write("Pick up to 10 numbers between (1 - 80): ");
                String input = Console.ReadLine();
                ArrayList pick_storage = new ArrayList(); //Plan to store some numbers
                //Regular Expressions are great for String parsing and intuitively collecting data
                if (Regex.Match(input, "[\\s,;:]").Success) { // This expression means if any character in the string matches a space, comma, semicolon, or colon.
                    String[] unums = Regex.Split(input, "[\\s,;:]"); // Same Expression but splits the string into an array using the expression.
                    for (int i = 0; i < unums.Length; i++) { //Iterate the array
                        try { //Splitting a string can have valid empty strings,
                            int a1 = int.Parse(unums[i]); //trying to parse the string will catch letters, special characters and empty strings
                            if (a1 > 0 && a1 <= 80 && !pick_storage.Contains(a1)) //Numbers must be positive less then the selection range and not duplicated
                                pick_storage.Add(a1);
                        } catch {
                            //Gracefully Handle Exceptions, Do Nothing! We'll assume the entry is a typo and skip it.
                        }
                    }
                } else {//If the expression doesn't match, I'm assuming the user is entering a single number
                    try {
                        int a1 = int.Parse(input);
                        if (a1 > 0 && a1 <= 80 && !pick_storage.Contains(a1))
                            pick_storage.Add(a1);
                    } catch { //At this point they might be mashing buttons on a keyboard, we'll give the user a chance to leave
                        Console.WriteLine($"{input} is not a number.\n\n"); //Show them the error
                        Console.Write("Continue? (Yes, no): ");//Ask if they want to quit
                        String a2 = Console.ReadLine();
                        if (a2.StartsWith("Y") || a2.StartsWith("y")) //explicit yes
                            continue; //Start the loop over
                        else
                            break; //Break the loop
                    }
                }
                if (pick_storage.Count < 1) { //Santity check, I don't know if we even have numbers stored yet.
                    Console.WriteLine("No Numbers Found!\n\n");
                    Console.Write("Play again? (Yes, no): ");
                    String a2 = Console.ReadLine();
                    if (a2.StartsWith("Y") || a2.StartsWith("y")) //explicit yes
                        continue;
                    else
                        break;
                }
                Console.Write("Money to wager: $");
                String input2 = Console.ReadLine();
                Decimal money;
                try {
                    money = new Decimal(double.Parse(input2)); //We must wager some fake money.
                } catch {
                    Console.WriteLine($"{input2} is not a accepted value!\n\n");
                    Console.Write("Play again? (Yes, no):");
                    String a2 = Console.ReadLine();
                    if (a2.StartsWith("Y") || a2.StartsWith("y")) //explicit yes
                        continue;
                    else
                        break;
                }
                Console.WriteLine("\n\n===============Drawings Numbers===============");
                int hits = 0;
                ArrayList draw_storage = new ArrayList(); //Store already drawn numbers to not duplicate any
                for (int i = 0; i < 20; i++) { //Select 20 numbers
                    System.Threading.Thread.Sleep(1000); //Add some suspense by forcing the user to wait for a second (time is in milliseconds)
                    int draw = generator.Next(1, 80);
                    while (draw_storage.Contains(draw)) { //Keep drawing until we get a unique number
                        draw = generator.Next(1, 80);
                    }
                    draw_storage.Add(draw); //Store the number so we can stop looking
                    if (pick_storage.Contains(draw)) { //Determine if the number matches one of the picks
                        Console.Write($"*{draw}* Hit ");
                        hits++; //Use a hit counter for a win formula
                    } else {
                        Console.Write($"{draw} ");
                    }
                }
                Console.WriteLine("\n\n==== Results ====\n");
                Decimal prize = Decimal.Multiply(((hits / pick_storage.Count) * pick_storage.Count) * 2, money); //Formula I made up for keno
                Console.WriteLine($"You picked {pick_storage.Count} number(s). Had {hits} Hits. Bet ${money:C}!"); 
                if (prize > 0)
                    Console.WriteLine($"You win ${prize:C}!"); // (10/10) * 10 * 2 = 20 The win is 20x possible with 10 numbers
                else
                    Console.WriteLine("Better luck next time!");// (1/1) * 1 * 2 = 2 The win is 2x possible with 1 number
                Console.Write("\n\nPlay again? (Yes, no): ");
                String a3 = Console.ReadLine();
                if (a3.StartsWith("Y") || a3.StartsWith("y")) //explicit yes
                    continue;
                else
                    break;
            }
            Console.WriteLine("Press Any Key...");
            Console.ReadLine();
        }
    }
}