what is the free cash flow?

During the year, Xero, Inc, experienced an increase in net fixed assets of $305,000 and had depreciation of $198,000. It also experienced an increase in current assets of $147,000 and an increase in accounts payable of $77,000. If operating cash flow (OCF) for the year was $705,000, calculate the firm's free cash flow (FCF) for the year