Hiker Harry has a pedometer to count his steps. The pedometer records up to $999999$ steps, then flips over to $000000$ on the next step. Harry plans to determine his mileage for a hiking trip. At the start of the trip, Harry sets the pedometer to $000000$. During the trip, the pedometer flips from $999999$ to $000000$ three times. At the end of the trip, the pedometer reads $800000$. Harry takes $1600$ steps per mile. Which of the following is closest to the number of miles Harry walked during the trip?