Puzzle 4: Shoot the crazy monkey

Puzzle 4: There 5 trees in a row. There is one monkey on the tree who is physic. You have to shot him with your gun. But he is very smart too. You are allowed to shoot on any tree, if monkey is on that tree then he will die, else he will make jump to next or previous tree for sure. You can only see monkey if he die.

How many shots(maximum shots) you need to make sure that monkey get killed.
Show Solution

Solution: 8 Shots
Explanation: Start from one end. Let us suppose start from Tree 1.
Shoot on Tree 1. Monkey is not there he jump.
Shoot again on Tree 1. If from step 1 he jump to tree 1 then he die. Else shoot twice on tree 2 and so on.
By doing this monkey will be killed or he is moving towards tree 5.
Once you reach at tree 4, monkey will be either at tree5 or tree 4 and he will be killed for sure.