included DLLs

153150-cubes.jpgI have created project with cubes only and tried a test build but to my surprise the build was about 21mb. When checked the editor log, I found out that “included DLLs” are the main culprit consuming ~46% of the build. I have not included any 2 party assets or anything else. Even the only script in the project was for “Go to next scene”. Can anyone help.

Just now I test with only single cube in the scene and still the editor log gives me same size 13.2mb (92%) of total build size of 16.1mb. Is this the standard size of the “included DLLs”?