There are boxes in this poem

There will be four boxes in this room
That is regarded
If you add three boxes
To the one box there.
If you discard five more
After you add another six boxes
There will be five boxes left in this room.
There will still be six boxes left
If ten more appear and nine disappear.
If four boxes taken and all four disregarded
The six boxes are still sitting on the table. None is remaining
If all six are taken .
And twenty six are added
But one is regarded
In this poem,
There will be one box left .

Bose