Total current assets are worth $237,513 at book value and $191,299 at market value. In addition, plant and equipment has a market value of $343,222 and a book value of $560,320. The company's total current liabilities are valued at market for $134,889, and have a book value of $129,175. Both the book value and the market value of long-term debt is $144,000. If the company's total assets have a market value of $534,521 and a book value of $797,833, what is the difference between the book value and market value of its stockholders' equity?