The following transactions occurred during July:

1. Received $1,800 cash for services performed during July.

2. Received $8,500 cash from the issuance of common stock to owners.

3. Received $900 from a customer as payment for services performed during June.

4. Billed $5,000 to customers for services performed on account in July.

5. Borrowed $3,500 from the bank and signed a promissory note.

6. Received $2,500 from a customer for services to be performed during August.

As a result of these transactions, what is the amount of the increase to the Cash account?