The 2017 balance sheet of Kerber's Tennis Shop, Incorporated, showed $2.85 million in long-term debt, $790,000 in the common stock account, and $5.9 million in the additional paid-in surplus account. The 2018 balance sheet showed $4.1 million, $925,000, and $8.15 million in the same three accounts, respectively. The 2018 income statement showed an interest expense of $200,000. The company paid out $630,000 in cash dividends during 2018. If the firm's net capital spending for 2018 was $720,000, and the firm reduced its net working capital investment by $205,000, what was the firm's 2018 operating cash flow, or OF?