class BankAccount {
    private int balance;
    private String accNum;

    public BankAccount(String a) {
        accNum = a;
        balance = 0;
    }

    public void deposit(int amount) {
        balance = balance + amount;
    }

    public int getBalance() {
        return balance;
    }

    public int withdraw(int amount) throws Exception{
        if (balance>=amount){
            balance-=amount;
            return balance;
        }else{
            throw new Exception("Insufficient balance");
        }
    }
}