From the way I understood it to say.
If Say 15 people actually ran in the 1D, then they would put 15 entry fees in the 1D.
If 35 people ran in the 2D they would put 35 entry fees in the 2D.
If 70 people ran in the 3D they would put 70 entry fees in the 3D.
So On and so on.....
Does that make since now?