Several years ago, John purchased 2,000 shares of Red Corporation's § 1244 stock from Mark for $40,000. Last year, John sold one-half of his Red Corporation stock to Mike for $12,000. During the current year, John sold the remaining Red Corporation stock for $3,000. John has a $17,000 ($3,000 – $20,000) ordinary loss for the current year. What's amount of loss can John can deduct for the current year?