import java.util.Scanner;

class Account {
    private String accountNumber;
    private double balance;

    // Constructor to initialize account number and balance
    public Account(String accountNumber, double balance) {
        this.accountNumber = accountNumber;
        this.balance = balance;
    }

    // Withdraw method that throws IllegalArgumentException for invalid amounts
    public void withdraw(double amount) throws IllegalArgumentException {
        if (amount > balance) {
            throw new IllegalArgumentException("Insufficient funds for this transaction.");
        }
        if (amount < 0) {
            throw new IllegalArgumentException("Withdrawal amount cannot be negative.");
        }
        balance -= amount;
        System.out.println("Withdrawal successful. New balance: " + balance);
    }
}

public class Main {
    public static void main(String[] args) {
        // Creating an instance of Account with a sample account number and balance
        Account account = new Account("123456789", 1000.00);

        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the amount to withdraw: ");
        
        try {
            double amount = scanner.nextDouble();
            account.withdraw(amount);
        } catch (IllegalArgumentException e) {
            System.out.println("Error: " + e.getMessage());
        } finally {
            scanner.close();
        }
    }
}