30. On the Magic Island, the divine monkeys feed on immortal peaches. Every noon, each divine monkey eats one immortal peach; by evening, both the monkeys and the peaches on the island can clone themselves. If there are 2000 divine monkeys and 50000 immortal peaches on the first morning, then by the afternoon of the $\qquad$th day, all the immortal peaches will be eaten up.
$25$