I had a different formulation, that suggested you stick with the first hypothesis you picked.
Now, x1 is a finite real number. So in order for this series to converge, there must be only a finite number of other terms in the series equal to or greater than x1. There will therefore be some complexity value, y1, such that all hypotheses with a complexity value different to y1 have an average probability of less than x1.
I had a different formulation, that suggested you stick with the first hypothesis you picked.
Definitely better.