28. A problem solved by Poisson (1781-1840) in his youth. Someone has 12 pints (a unit of volume) of honey and wants to pour out half of this amount, but he does not have a container with a capacity of 6 pints. He has 2 containers: one with a capacity of 8 pints, and the other with a capacity of 5 pints. How can he pour 6 pints of honey into the 8-pint container? What is the minimum number of transfers required to do this? (This problem determined Poisson's life path: he dedicated his entire life to mathematics.)
28. Let's represent it with such a diagram:

| Vessel |  |  |
| :---: | :---: | :---: |
| 12 pints | 8 pints | 5 pints |
| 12 | - | - |
| 4 | 8 | - |
| 4 | 3 | 5 |
| 9 | - | - |
| 1 | 8 | 3 |
| 1 | 6 | 3 |
| 6 | 6 | - |