Need help with this finance problem please. thank you

The following table contains national income accounting data for a hypothetical economy: Disposable personal income $6,000 million Personal income tax and nontax payments $ 800 million Government and business transfer payments $1,400 million Corporate taxes, Social Security contributions, and corporate retained earnings $1,000 million Indirect business taxes $ 750 million Depreciation $ 900 million Starting from the value for disposable personal income (DPI), gross domestic product is calculated to be $D (enter your response as an integer)