Denis saves the dayyyyy, by going to the corner

[Denis]

Here I come to save the dayyyyy.......
Pretend border is all around, do the work, then remove a border

Btw, answer is an integer.

 

[Harry_the_cat]

Here I come to save the dayyyyy.......
Pretend border is all around, do the work, then remove a border

Btw, answer is an integer.

Are you sure Denis? I don't get an integer.

 

[Denis]

Are you sure Denis? I don't get an integer.

Neither do I no more! sqrt(17) - 3
Heading fer da corner...