During the process of the military exercise, there is a ship on the sea level .The ship will go to certain place to carry out a task. For every action, the ship has two ways to sail. They are normal sailing and accelerated sailing. The normal speed of the ship is certain, when the ship sails normally, it can only move 1 step to the adjacent normal sea level. The ship can also accelerate. There are 2 kinds of accelerated sailings, one is moving forward d steps (d <= 5) in a straight line, and it must move forward d steps exactly every time it accelerates, The d steps must be on the normal sea level, otherwise, it can not accelerate. The other is accelerating while getting through the undercurrent. There are a lot of undercurrents on the sea, and entering the undercurrent area needs to accelerate when the ship is 1 step to the undercurrent. However, the ship itself will be damaged more or less by the undercurrent, After entering the undercurrent, the speed of the ship will become normal immediately. Every time it accelerates, the ship has to consume a certain B energy, and when it starts up ,it carries certain B energy.
While the ship is sailing on the sea, it needs to consume a certain A energy. One unit of distance will consume one unit of A energy, and when the ship starts up, it carries enough A energy.
There are many reefs on the sea, and the ship can not get through.
Now the ship is required to sail to the certain place, of course, to minimize the damage to the ship itself is a priority because the cost of ships is very expensive. The damage is, of course, the smaller, the better. At the same time, an attempt should be made to control the consumption of A energy to the smallest amount during the whole process because the cost of A energy is much more expensive than that of B energy, and you can use B energy which the ship carried when it started up as you wish.
Now the question is to work out the minimal times of action from the departure point to the destination under the condition that to minimize the damage to the ship is a priority and then the consumption of A energy to the smallest degree.