Post-increment x by n (n != 1)

So, if I execute the following code...

int x = 0;
Debug.WriteLine(x++);
Debug.WriteLine(x += 4);
Debug.WriteLine(x);

... I get 0, 5, and 5, respectively. What I'd like to get, however is 0, 1, and 5. Is there any way to do a post-increment by n in C#? Or do I have to write out the += as its own statement?

Just for context, what I'm actually doing is a bunch of BitConverter operations on a buffer, and it'd be really nice to have each one as a self-sufficient statement where the offset is incremented by the size of the data type being converted to. That way, if the buffer format is later changed, I can just add or remove the one line without having to worry about any of the surrounding code.