Hello! I have an image folder called "i" in site's root folder, it has many subfolders like 0, 100, 200, 300 ... 600000, etc..
So in folder "200" there are images from 200.jpg to 299.jpg, in folder "300" there are 300.jpg to 399.jpg ans so on. As you can see i create a new folder for every 100th image because i don't want to have all the images in one folder (there are too much).

The problem is that i can't calculate a proper folder name, i tried like this:

location ~ /i/(.*)\.jpg {
set $folder $1-($1%100);
try_files /i/$folder/$1.jpg =400;
}

but of course it does not work due to syntax error.

Help me please