Let S=maximal posible sum of points
Then S=max{S:S/N<x+0.05},S=min(s,10*N);
with multiplying by 100 we have the problem in integers
If L is an answer then L=min(L:(S+L)/(N+L)<y=0.05);
After multiplying by 100 we againg work in integers. But WA11