
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
There are  $n$  boxes which is numbere from  $1$  to  $n$ . The box with number  $1$  is open, and the others are closed. There are   $m$  identical balls ( $m\geq n$ ). One of the balls is put into the open box, then we open the box with number  $2$ . Now, we put another ball to one of two open boxes, then we open the box with number  $3$ . Go on until the last box will be open. After that the remaining balls will be randomly put into the boxes.  In how many ways this arrangement can be done?

Present the answer in LaTex format: \boxed{Your answer}
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