13.1 A store has received large cans of milk. The salesperson has a scale lacking weights (milk bottles can be placed on the scale pans), and there are 3 identical milk bottles, two of which are empty, and the other contains 1 liter of milk. How can one bottle be filled with exactly 85 liters of milk, using the scale no more than 8 times (assuming the milk bottle's capacity exceeds 85 liters)?
[Solution] First, weigh 5 times, with quantities of $1,1,2,4,8$ liters respectively, then add the original 1 liter, and pour all into one bottle, totaling 17 liters. Then, weigh out $17,17,34$ liters in 3 times, and pour into one bottle, which is exactly 85 liters.