Bank Account Encapsulation

Declare class BankAccount with a private integer Balance.

• Constructor NEW(Start) stores the opening balance
• Deposit(Amount) adds Amount only when Amount > 0
• Withdraw(Amount) subtracts Amount only when Amount > 0 and Amount <= Balance
• GetBalance() returns the current balance

The test harness reads an opening balance, then N operations. Each operation is D (deposit) or W (withdraw) followed by an amount. Output the final balance.

Input: Start, N, then N pairs of operation and amount. Output: One integer.

Example:

Input:  100
        4
        D
        50
        W
        20
        D
        -5
        W
        1000
Output: 130