Jay is an avid farmer, and he wants to sell some of his corn crops. Initially, he has 500 corn stalks. On each day i [1..30], he rolls a fair 6-sided die. Wanting to sustain the farm, he plants i new corn stalks if the die has an even value. If the die has an odd value, he harvests and sells 10 stalks of corn (meaning they are no longer on the farm). How many corn stalks should he expect to have on his farm after the 30 days?