Damien, not a dealer in real estate, sold real estate with a basis of $250,000 for $500,000 cash, a note for $250,000, and the buyer assumed Damien's mortgage on the property of $125,000. During the year, the purchaser paid Damien $30,000 principal and $72,000 interest on the note and paid $6,000 principal and $18,000 interest on the mortgage he assumed. The contract price for the above transaction is what amount?