static void Main(string[] args)
{
var account = new Account();
account.Withdraw(50);
account.ShowBalance();
account.ShowBonus();
account.Deposit(500);
account.ShowInfo();
account.Withdraw(530);
account.ShowInfo();
account.Upgrade("gold");
account.Deposit(150);
account.Downgrade("base");
account.ShowInfo();
account.Withdraw(160.5);
Console.WriteLine(account.ShowBalance());
account.Close();
account.ShowInfo();
account.NewAccount(false);
account.Deposit(50);
account.Withdraw(10);
account.Upgrade();
account.ShowInfo();
account.NewAccount(true);
account.ShowInfo();
}