So, assuming that's a growing startup, if all engineers keep committing 0.5/1k LOC/w with number of engineers doubling every year, what will your codebase grow

So, assuming that's a growing startup, if all engineers keep committing 0.5/1k LOC/w with number of engineers doubling every year, what will your codebase grow to in 5 years' time? Let's say you have 20 engineers now (low for 8 year old startup). That's 1M LOC/annum. Next year you add another 2M. Where does this go?