Simulate a simple cash machine. The account balance starts at 500 and the correct PIN is 1234. **Step 1 - PIN entry:** The user has up to 3 attempts. For each wrong PIN, output `Wrong PIN`. A correct PIN moves on to Step 2. If all 3 attempts are wrong, output `Card blocked` and stop (do not input anything else). **Step 2 - Withdrawals:** Repeatedly input a withdrawal amount (a non-negative integer) until 0 is entered. For each amount: - If it is greater than the current balance, output `Insufficient funds`. - Otherwise, if it is not a multiple of 10, output `Invalid amount`. - Otherwise, subtract it from the balance and output the new balance. When 0 is entered, output `Goodbye`. For example, the inputs 1234, 100, 0 produce `400` then `Goodbye` (one per line).