Brutus and Olive were married when Brutus unexpectedly died on August 4, 2015. They had both owned and lived in the same house for 25 years, which they bought for $50,000. Olive sold the house on December 2, 2017 for $500,000 and then filed her tax return. 

How much of her gain from the sale of her home, if any, can Olive exclude from taxable income.