How You Found Quotidian Quintilian XV

Here's a puzzler:

mass riddle if one person went downstairs the number would be equal if one person went upstairs the number would double

Start with one person in the basement, four people on the ground level, and three people upstairs. Then you hit the f button, or whatever it is, and you end up with two people in the basement, two people on the ground level, and four upstairs. If 205.188.116 from somewhere in the neighborhood of Wichita, Kansas didn't find it before, they'll find it now.

Now what mass has to do with it, I have no idea. For that I would recommend this book. If anybody can set you straight there, Father Driscoll can.