class InsufficientFundsException extends Exception {
    public InsufficientFundsException(String message) {
        super(message);
    }
}

class NegativeAmountException extends Exception {
    public NegativeAmountException(String message) {
        super(message);
    }
}

class BankAccount {
    private double balance;

    public BankAccount(double balance) {
        this.balance = balance;
    }

    public void withdraw(double amount) throws InsufficientFundsException, NegativeAmountException {
        if (amount < 0) {
            throw new NegativeAmountException("Amount cannot be negative.");
        } else if (amount > balance) {
            throw new InsufficientFundsException("Insufficient funds for this withdrawal.");
        } else {
            balance -= amount;
            System.out.println("Withdrawal successful. New balance: $" + balance);
        }
    }

    public double getBalance() {
        return balance;
    }
}

public class Main {
    public static void main(String[] args) {
        BankAccount account = new BankAccount(500);

        try {
            account.withdraw(600); // Should throw InsufficientFundsException
        } catch (InsufficientFundsException | NegativeAmountException e) {
            System.out.println("Error: " + e.getMessage());
        }

        try {
            account.withdraw(-50); // Should throw NegativeAmountException
        } catch (InsufficientFundsException | NegativeAmountException e) {
            System.out.println("Error: " + e.getMessage());
        }

        try {
            account.withdraw(100); // Should be successful
        } catch (InsufficientFundsException | NegativeAmountException e) {
            System.out.println("Error: " + e.getMessage());
        }
    }
}